if shippers do not meet the minimum contracted volume commitments under our ship-or-pay contracts , we have the right to charge for reserved capacity or for deficiency payments as described in “ critical accounting policies and estimates - revenue recognition . ” assets in which we own interests also earn revenue by shipping crude oil and refined products on a spot rate basis in accordance with our tariff or posted rate sheets and under buy/sell agreements . the commitments under our long-term transportation , terminaling and storage service agreements with shippers and the volumes which we handle in our pipelines and storage tanks are primarily affected by the supply of , and demand for , crude oil , refinery gas , natural gas and refined products in the markets served directly or indirectly by our assets . this supply and demand is impacted by the market prices for these products in the markets we serve . the results of our operations will be impacted by our ability to : maintain utilization of and rates charged for our pipelines and storage facilities ; utilize the remaining uncommitted capacity on , or add additional capacity to , our pipeline systems ; increase throughput volumes on our pipeline systems by making connections to existing or new third party pipelines or other facilities , primarily driven by the anticipated supply of , and demand for , crude oil and refined products ; and identify and execute organic expansion projects . operations and maintenance expenses our management seeks to maximize our profitability by effectively managing operations and maintenance expenses . these expenses are comprised primarily of labor expenses ( including contractor services ) , insurance costs ( including coverage for our consolidated assets and operated joint ventures ) , utility costs ( including electricity and fuel ) and repairs and maintenance expenses . utility costs fluctuate based on throughput volumes and the grades of crude oil and types of refined products we handle . management has performed a strategic evaluation of its insurance coverage and upon renewal of the contracts in the fourth quarter of 2017 , all of our insurance coverage is now provided by a wholly owned subsidiary of shell . this will result in both overall cost savings and improved coverage . our other operations and maintenance expenses generally remain stable across broad ranges of throughput and storage volumes , but can fluctuate from period to period depending on the mix of activities , particularly maintenance activities , performed during a period . at times , the fluctuation in operations and maintenance expenses may materially increase due to the performance of planned maintenance , such as turnaround work and asset integrity work , and unplanned maintenance , such as repair of damage caused by a natural disaster . adjusted ebitda and cash available for distribution adjusted ebitda and cash available for distribution have important limitations as analytical tools because they exclude some , but not all , items that affect net income and net cash provided by operating activities . you should not consider adjusted ebitda or cash available for distribution in isolation or as a substitute for analysis of our results as reported under gaap . additionally , because adjusted ebitda and cash available for distribution may be defined differently by other companies in 54 our industry , our definition of adjusted ebitda and cash available for distribution may not be comparable to similarly titled measures of other companies , thereby diminishing their utility . the gaap measures most directly comparable to adjusted ebitda and cash available for distribution are net income and net cash provided by operating activities . adjusted ebitda and cash available for distribution should not be considered as an alternative to gaap net income or net cash provided by operating activities . please refer to “ results of operations - reconciliation of non-gaap measures ” for the reconciliation of gaap measures net income and cash provided by operating activities to non-gaap measures adjusted ebitda and cash available for distribution . we define adjusted ebitda as net income before income taxes , net interest expense , gain or loss from dispositions of fixed assets , allowance oil reduction to net realizable value , and depreciation , amortization and accretion , plus cash distributed to us from equity investments for the applicable period , less income from equity investments . we define adjusted ebitda attributable to the partnership as adjusted ebitda less adjusted ebitda attributable to noncontrolling interests and adjusted ebitda attributable to parent . we define cash available for distribution as adjusted ebitda attributable to the partnership less maintenance capital expenditures attributable to the partnership , net interest paid , cash reserves and income taxes paid , plus net adjustments from volume deficiency payments attributable to the partnership and certain one-time payments received . cash available for distribution will not reflect changes in working capital balances . we believe that the presentation of these non-gaap supplemental financial measures provides useful information to management and investors in assessing our financial condition and results of operations . we present these financial measures because we believe replacing our proportionate share of our equity investments ' net income with the cash received from such equity investments more accurately reflects the cash flow from our business , which is meaningful to our investors . adjusted ebitda and cash available for distribution are non-gaap supplemental financial measures that management and external users of our consolidated financial statements , such as industry analysts , investors , lenders and rating agencies , may use to assess : our operating performance as compared to other publicly traded partnerships in the midstream energy industry , without regard to historical cost basis or , in the case of adjusted ebitda , financing methods ; the ability of our business to generate sufficient cash to support our decision to make distributions to our unitholders ; our ability to incur and service debt and fund capital expenditures ; and the viability story_separator_special_tag in connection with the acquisition of the refinery gas pipeline asset , shell chemical agreed to reimburse us for our share of certain costs and expenses with respect to the conversion project . during 2017 , we incurred costs and expenses related to the project , and filed claims for reimbursement from shell chemical , of $ 1.7 million which were treated as capital contributions from our parent . with the project suspended , we expect to incur immaterial maintenance capital expenditures to close out this project in 2018. for expected capital expenditures in 2018 , refer to capital resources and liquidity - capital expenditures . major expansion projects in june 2017 , zydeco began construction on a tank expansion project in houma to address future capacity shortfalls during tank maintenance which will allow us to service additional capacity , as well as allow for existing tanks to come out of service for regularly scheduled inspection and maintenance . we are building two 250,000 barrel working tanks at the existing houma facility for a total of $ 44.1 million , of which $ 17.5 million was incurred in 2017 , and the remaining spend is currently expected to be incurred in 2018. the scope includes interconnecting piping , dike expansion and associated facility work . customers 58 we transport and store crude oil , refined products , natural gas , and refinery gas for a broad mix of customers , including producers , refiners , marketers and traders , and are connected to other crude oil and refined products pipelines . in addition to serving directly-connected u.s. gulf coast markets , our crude oil and refined products pipelines have access to customers in various regions of the united states through interconnections with other major pipelines . our customers use our transportation and storage services for a variety of reasons . refiners typically require a secure and reliable supply of crude oil over a prolonged period of time to meet the needs of their specified refining diet and frequently enter into long-term firm transportation agreements to ensure a ready supply of crude oil , rate surety and sometimes sufficient transportation capacity over the life of the contract . similarly , chemical sites require a secure and reliable supply of refinery gas to crackers and enter into long-term firm transportation agreements to ensure steady supply . producers of crude oil and natural gas require the ability to deliver their product to market and frequently enter into firm transportation contracts to ensure that they will have sufficient capacity available to deliver their product to delivery points with greater market liquidity . marketers and traders generate income from buying and selling crude oil and refined products to capitalize on price differentials over time or between markets . our customer mix can vary over time and largely depends on the crude oil and refined products supply and demand dynamics in our markets . refer to note 12 - transactions with major customers and concentration of credit risk for additional information . competition our pipeline systems compete primarily with other interstate and intrastate pipelines and with marine and rail transportation . some of our competitors may expand or construct transportation systems that would create additional competition for the services we provide to our customers . in addition , future pipeline transportation capacity could be constructed in excess of actual demand , which could reduce the demand for our services , in the market areas we serve , and could lead to the reduction of the rates that we receive for our services . while we do see some variation from quarter-to-quarter resulting from changes in our customers ' demand for transportation , this risk has historically been mitigated by the long-term , fixed rate basis upon which we have contracted a substantial portion of our capacity . however , contracts representing approximately 30.0 % of our revenues for the year ended december 31 , 2017 will expire in 2018 and 2019. our business may be negatively affected if we are unable to renew or replace our contract portfolio on comparable terms . our storage terminal competes with surrounding providers of storage tank services . some of our competitors have expanded terminals and built new pipeline connections , and third parties may construct pipelines that bypass our location . these , or similar events , could have a material adverse impact on our operations . our refined products terminals generally compete with other terminals that serve the same markets . these terminals may be owned by major integrated oil and gas companies or by independent terminaling companies . while fees for terminal storage and throughput services are not regulated , they are subject competition from other terminals serving the same markets . however , our contracts provide for stable , long term revenue , which is not impacted by market competitive forces . regulation our assets are subject to regulation by various federal , state and local agencies . under its current policy , ferc permits regulated interstate oil and gas pipelines , including those owned by master limited partnerships , to include an income tax allowance in their cost of service used to calculate cost-based transportation rates . the allowance is intended to reflect the actual or potential tax liability attributable to the regulated entity 's operating income , regardless of the form of ownership . on july 1 , 2016 , in united airlines , inc. v ferc , the united states court of appeals for the d.c. circuit vacated a pair of ferc orders to the extent they permitted an interstate refined petroleum products pipeline owned by a master limited partnership to include an income tax allowance in its cost-of-service-based rates . the d.c. circuit held that ferc had failed to demonstrate that the inclusion of an income tax allowance in the pipeline 's rates would not lead to an over-recovery of costs attributable to regulated service . the d.c. circuit instructed ferc on

debt repayment . in december 2017 , we used borrowings under the five year revolver due december 2022 and the five year fixed facility to repay $ 268.1 million of borrowings under the five year revolving credit facility due october 2019 ( the “ five year revolver due october 2019 ” ) . in september 2017 , we used net proceeds from sales of common units to third parties to repay $ 265.0 million of borrowings under our five year revolver due october 2019. december 2017 acquisition . on december 1 , 2017 , we completed the december 2017 acquisition , which included a 100 % interest in triton , 41.48 % of the issued and outstanding membership interest in locap , an additional 22.9 % interest in mars , an additional 22.0 % interest in odyssey , and an additional 10.0 % interest in explorer from splc and equilon enterprises llc d/b/a shell oil products us ( “ sopus ” ) for $ 825.0 million in cash . october 2017 acquisition . on october 17 , 2017 , we completed the october 2017 acquisition of a 50.0 % interest in permian basin from a third party for $ 49.9 million in consideration and initial capital contributions . equity offering . in september 2017 , we completed the sale of 5,170,000 common units in a registered public offering for proceeds of $ 135.1 million , and we issued 105,510 general partner units to our general partner for $ 2.8 million in order to maintain its 2 % general partner interest . atm program . in september 2017 , we completed the sale of 5,200,000 common units under this program for $ 139.8 million net proceeds , and we issued 106,122 general partner units to our general partner for $ 2.9 million in order to maintain its 2 % general partner interest . in june 2017 , we completed the sale of 94,925 common units under this program for $ 2.9 million net proceeds , and we issued 1,938 general partner units to our general partner for $ 0.1 million in order to maintain its 2 % general partner interest . may 2017 acquisition .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```debt repayment . in december 2017 , we used borrowings under the five year revolver due december 2022 and the five year fixed facility to repay $ 268.1 million of borrowings under the five year revolving credit facility due october 2019 ( the “ five year revolver due october 2019 ” ) . in september 2017 , we used net proceeds from sales of common units to third parties to repay $ 265.0 million of borrowings under our five year revolver due october 2019. december 2017 acquisition . on december 1 , 2017 , we completed the december 2017 acquisition , which included a 100 % interest in triton , 41.48 % of the issued and outstanding membership interest in locap , an additional 22.9 % interest in mars , an additional 22.0 % interest in odyssey , and an additional 10.0 % interest in explorer from splc and equilon enterprises llc d/b/a shell oil products us ( “ sopus ” ) for $ 825.0 million in cash . october 2017 acquisition . on october 17 , 2017 , we completed the october 2017 acquisition of a 50.0 % interest in permian basin from a third party for $ 49.9 million in consideration and initial capital contributions . equity offering . in september 2017 , we completed the sale of 5,170,000 common units in a registered public offering for proceeds of $ 135.1 million , and we issued 105,510 general partner units to our general partner for $ 2.8 million in order to maintain its 2 % general partner interest . atm program . in september 2017 , we completed the sale of 5,200,000 common units under this program for $ 139.8 million net proceeds , and we issued 106,122 general partner units to our general partner for $ 2.9 million in order to maintain its 2 % general partner interest . in june 2017 , we completed the sale of 94,925 common units under this program for $ 2.9 million net proceeds , and we issued 1,938 general partner units to our general partner for $ 0.1 million in order to maintain its 2 % general partner interest . may 2017 acquisition .
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 Suspicious Activity Report : if shippers do not meet the minimum contracted volume commitments under our ship-or-pay contracts , we have the right to charge for reserved capacity or for deficiency payments as described in “ critical accounting policies and estimates - revenue recognition . ” assets in which we own interests also earn revenue by shipping crude oil and refined products on a spot rate basis in accordance with our tariff or posted rate sheets and under buy/sell agreements . the commitments under our long-term transportation , terminaling and storage service agreements with shippers and the volumes which we handle in our pipelines and storage tanks are primarily affected by the supply of , and demand for , crude oil , refinery gas , natural gas and refined products in the markets served directly or indirectly by our assets . this supply and demand is impacted by the market prices for these products in the markets we serve . the results of our operations will be impacted by our ability to : maintain utilization of and rates charged for our pipelines and storage facilities ; utilize the remaining uncommitted capacity on , or add additional capacity to , our pipeline systems ; increase throughput volumes on our pipeline systems by making connections to existing or new third party pipelines or other facilities , primarily driven by the anticipated supply of , and demand for , crude oil and refined products ; and identify and execute organic expansion projects . operations and maintenance expenses our management seeks to maximize our profitability by effectively managing operations and maintenance expenses . these expenses are comprised primarily of labor expenses ( including contractor services ) , insurance costs ( including coverage for our consolidated assets and operated joint ventures ) , utility costs ( including electricity and fuel ) and repairs and maintenance expenses . utility costs fluctuate based on throughput volumes and the grades of crude oil and types of refined products we handle . management has performed a strategic evaluation of its insurance coverage and upon renewal of the contracts in the fourth quarter of 2017 , all of our insurance coverage is now provided by a wholly owned subsidiary of shell . this will result in both overall cost savings and improved coverage . our other operations and maintenance expenses generally remain stable across broad ranges of throughput and storage volumes , but can fluctuate from period to period depending on the mix of activities , particularly maintenance activities , performed during a period . at times , the fluctuation in operations and maintenance expenses may materially increase due to the performance of planned maintenance , such as turnaround work and asset integrity work , and unplanned maintenance , such as repair of damage caused by a natural disaster . adjusted ebitda and cash available for distribution adjusted ebitda and cash available for distribution have important limitations as analytical tools because they exclude some , but not all , items that affect net income and net cash provided by operating activities . you should not consider adjusted ebitda or cash available for distribution in isolation or as a substitute for analysis of our results as reported under gaap . additionally , because adjusted ebitda and cash available for distribution may be defined differently by other companies in 54 our industry , our definition of adjusted ebitda and cash available for distribution may not be comparable to similarly titled measures of other companies , thereby diminishing their utility . the gaap measures most directly comparable to adjusted ebitda and cash available for distribution are net income and net cash provided by operating activities . adjusted ebitda and cash available for distribution should not be considered as an alternative to gaap net income or net cash provided by operating activities . please refer to “ results of operations - reconciliation of non-gaap measures ” for the reconciliation of gaap measures net income and cash provided by operating activities to non-gaap measures adjusted ebitda and cash available for distribution . we define adjusted ebitda as net income before income taxes , net interest expense , gain or loss from dispositions of fixed assets , allowance oil reduction to net realizable value , and depreciation , amortization and accretion , plus cash distributed to us from equity investments for the applicable period , less income from equity investments . we define adjusted ebitda attributable to the partnership as adjusted ebitda less adjusted ebitda attributable to noncontrolling interests and adjusted ebitda attributable to parent . we define cash available for distribution as adjusted ebitda attributable to the partnership less maintenance capital expenditures attributable to the partnership , net interest paid , cash reserves and income taxes paid , plus net adjustments from volume deficiency payments attributable to the partnership and certain one-time payments received . cash available for distribution will not reflect changes in working capital balances . we believe that the presentation of these non-gaap supplemental financial measures provides useful information to management and investors in assessing our financial condition and results of operations . we present these financial measures because we believe replacing our proportionate share of our equity investments ' net income with the cash received from such equity investments more accurately reflects the cash flow from our business , which is meaningful to our investors . adjusted ebitda and cash available for distribution are non-gaap supplemental financial measures that management and external users of our consolidated financial statements , such as industry analysts , investors , lenders and rating agencies , may use to assess : our operating performance as compared to other publicly traded partnerships in the midstream energy industry , without regard to historical cost basis or , in the case of adjusted ebitda , financing methods ; the ability of our business to generate sufficient cash to support our decision to make distributions to our unitholders ; our ability to incur and service debt and fund capital expenditures ; and the viability story_separator_special_tag in connection with the acquisition of the refinery gas pipeline asset , shell chemical agreed to reimburse us for our share of certain costs and expenses with respect to the conversion project . during 2017 , we incurred costs and expenses related to the project , and filed claims for reimbursement from shell chemical , of $ 1.7 million which were treated as capital contributions from our parent . with the project suspended , we expect to incur immaterial maintenance capital expenditures to close out this project in 2018. for expected capital expenditures in 2018 , refer to capital resources and liquidity - capital expenditures . major expansion projects in june 2017 , zydeco began construction on a tank expansion project in houma to address future capacity shortfalls during tank maintenance which will allow us to service additional capacity , as well as allow for existing tanks to come out of service for regularly scheduled inspection and maintenance . we are building two 250,000 barrel working tanks at the existing houma facility for a total of $ 44.1 million , of which $ 17.5 million was incurred in 2017 , and the remaining spend is currently expected to be incurred in 2018. the scope includes interconnecting piping , dike expansion and associated facility work . customers 58 we transport and store crude oil , refined products , natural gas , and refinery gas for a broad mix of customers , including producers , refiners , marketers and traders , and are connected to other crude oil and refined products pipelines . in addition to serving directly-connected u.s. gulf coast markets , our crude oil and refined products pipelines have access to customers in various regions of the united states through interconnections with other major pipelines . our customers use our transportation and storage services for a variety of reasons . refiners typically require a secure and reliable supply of crude oil over a prolonged period of time to meet the needs of their specified refining diet and frequently enter into long-term firm transportation agreements to ensure a ready supply of crude oil , rate surety and sometimes sufficient transportation capacity over the life of the contract . similarly , chemical sites require a secure and reliable supply of refinery gas to crackers and enter into long-term firm transportation agreements to ensure steady supply . producers of crude oil and natural gas require the ability to deliver their product to market and frequently enter into firm transportation contracts to ensure that they will have sufficient capacity available to deliver their product to delivery points with greater market liquidity . marketers and traders generate income from buying and selling crude oil and refined products to capitalize on price differentials over time or between markets . our customer mix can vary over time and largely depends on the crude oil and refined products supply and demand dynamics in our markets . refer to note 12 - transactions with major customers and concentration of credit risk for additional information . competition our pipeline systems compete primarily with other interstate and intrastate pipelines and with marine and rail transportation . some of our competitors may expand or construct transportation systems that would create additional competition for the services we provide to our customers . in addition , future pipeline transportation capacity could be constructed in excess of actual demand , which could reduce the demand for our services , in the market areas we serve , and could lead to the reduction of the rates that we receive for our services . while we do see some variation from quarter-to-quarter resulting from changes in our customers ' demand for transportation , this risk has historically been mitigated by the long-term , fixed rate basis upon which we have contracted a substantial portion of our capacity . however , contracts representing approximately 30.0 % of our revenues for the year ended december 31 , 2017 will expire in 2018 and 2019. our business may be negatively affected if we are unable to renew or replace our contract portfolio on comparable terms . our storage terminal competes with surrounding providers of storage tank services . some of our competitors have expanded terminals and built new pipeline connections , and third parties may construct pipelines that bypass our location . these , or similar events , could have a material adverse impact on our operations . our refined products terminals generally compete with other terminals that serve the same markets . these terminals may be owned by major integrated oil and gas companies or by independent terminaling companies . while fees for terminal storage and throughput services are not regulated , they are subject competition from other terminals serving the same markets . however , our contracts provide for stable , long term revenue , which is not impacted by market competitive forces . regulation our assets are subject to regulation by various federal , state and local agencies . under its current policy , ferc permits regulated interstate oil and gas pipelines , including those owned by master limited partnerships , to include an income tax allowance in their cost of service used to calculate cost-based transportation rates . the allowance is intended to reflect the actual or potential tax liability attributable to the regulated entity 's operating income , regardless of the form of ownership . on july 1 , 2016 , in united airlines , inc. v ferc , the united states court of appeals for the d.c. circuit vacated a pair of ferc orders to the extent they permitted an interstate refined petroleum products pipeline owned by a master limited partnership to include an income tax allowance in its cost-of-service-based rates . the d.c. circuit held that ferc had failed to demonstrate that the inclusion of an income tax allowance in the pipeline 's rates would not lead to an over-recovery of costs attributable to regulated service . the d.c. circuit instructed ferc on

