revenues and profitability our revenues , profitability and future growth depend substantially on our ability to find , develop and acquire natural gas and oil reserves that are economically recoverable , as well as prevailing prices for natural gas and oil . reserve replacement generally , producing properties offshore in the gulf of mexico have high initial production rates , followed by steep declines . likewise , initial production rates on new wells in the onshore resource plays start out at a relatively high rate with a decline curve which results in 60 % to 70 % of the ultimate recovery of present value occurring in the first eighteen months of the well 's life . we must locate and develop , or acquire , new natural gas and oil reserves to replace those being depleted by production . substantial capital expenditures are required to find , develop and or acquire natural gas and oil reserves . a prolonged period of depressed commodity prices could have a significant impact on the value and volumetric quantities of our proved reserve portfolio , assuming no other changes in our development plans . the merger with crimson allowed the company to add significant proved developed and undeveloped reserves and provided the company with access to several onshore resource plays which have substantial reserve growth potential , including in oil and liquids rich plays that position us to move to a more balanced oil/gas profile . use of estimates the preparation of our financial statements requires the use of estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements , and the reported amounts of revenues and expenses during the reporting periods . actual results could differ from those estimates . significant estimates with regard to these financial statements include estimates of remaining proved natural gas and oil reserves , the timing and costs of our future drilling , development and abandonment activities , and income taxes . see “ item 1a . risk factors ” for a more detailed discussion of a number of other factors that affect our business , financial condition and results of operations . 54 results of operations the table below sets forth our average net daily production data in mmcfe/d from our fields for each of the periods indicated : replace_table_token_24_th ( 1 ) includes a 26 day shut in for compressor repair during the three months ended march 31 , 2017 ( 2 ) includes a decreased production rate of 0.8 mmcfe/d due to temporary pipeline limitations during the three months ended june 30 , 2017 . ( 3 ) south timbalier 17 ceased production in august 2017 . ( 4 ) includes woodbine production from madison and grimes counties and conventional production in others . ( 5 ) includes eagle ford and buda production from karnes , zavala and dimmit counties , and conventional production in others . ( 6 ) includes onshore wells primarily in colorado , east texas , and wyoming during 2016 and onshore wells primarily in east texas and wyoming during 2017 . 55 year ended december 31 , 2017 compared to year ended december 31 , 2016 ; and year ended december 31 , 2016 compared to year ended december 31 , 2015 the table below sets forth revenue , production data , average sales prices and average production costs associated with our sales of natural gas , oil and natural gas liquids ( `` ngls `` ) from continuing operations for the years ended december 31 , 2017 , 2016 and 2015. oil , condensate and ngls are compared with natural gas in terms of cubic feet of natural gas equivalents . one barrel of oil , condensate or ngl is the energy equivalent of six mcf of natural gas . reported operating expenses include production taxes , such as ad valorem and severance . replace_table_token_25_th 56 replace_table_token_26_th 57 natural gas , oil and ngl sales and production all of our revenues are from the sale of our natural gas , crude oil and natural gas liquids production . our revenues may vary significantly from year to year depending on changes in commodity prices , which fluctuate widely , and production volumes . our production volumes are subject to wide swings as a result of new discoveries , weather and mechanical related problems . in addition , the production rate associated with our oil and gas properties declines over time as we produce our reserves . we reported revenues of approximately $ 78.5 million for the year ended december 31 , 2017 , compared to revenues of approximately $ 78.2 million for the year ended december 31 , 2016. this slight increase in revenues was primarily attributable to higher oil and natural gas prices in 2017 , which offset the decline in production caused by only adding five new producing wells in the southern delaware basin since late 2016 and minor non-core property sales . total production for the year ended december 31 , 2017 was approximately 20.1 bcfe , or 55.1 mmcfe/d , compared to approximately 26.0 bcfe , or 71.0 mmcfe/d , in the prior year . the decrease was attributable to a 6.7 mmcfe/d decline in production resulting from normal field decline and a limited 2016 drilling program , a 1.2 mmcfe/d decline due to non-core property sales , a 0.4 mmcfe/d decline from downtime associated with the impact of hurricane harvey , and a 0.2 mmcfe/d decline due to temporary pipeline limitations at the vermillion 170 field . the decrease in production was partially offset by 2.6 mmcfe/d of new production from drilling on our southern delaware basin acreage . story_separator_special_tag the company believes the following critical accounting policies affect its more significant judgments and estimates used in the preparation of the company 's consolidated financial statements : oil and gas properties - successful efforts our application of the successful efforts method of accounting for our natural gas and oil exploration and production activities requires judgments as to whether particular wells are developmental or exploratory , since exploratory costs and the costs related to exploratory wells that are determined to not have proved reserves must be expensed whereas developmental costs are capitalized . the results from a drilling operation can take considerable time to analyze , and the determination that commercial reserves have been discovered requires both judgment and application of industry experience . wells may be completed that are assumed to be productive and actually deliver natural gas and oil in quantities insufficient to be economic , which may result in the abandonment of the wells at a later date . on occasion , wells are drilled which have targeted geologic structures that are both developmental and exploratory in nature , and in such instances an allocation of costs is required to properly account for the results . delineation seismic costs incurred to select development locations within a productive natural gas and oil field are typically treated as development costs and capitalized , but often these seismic programs extend beyond the proved reserve areas and therefore management must estimate the portion of seismic costs to expense as exploratory . the evaluation of natural gas and oil leasehold acquisition costs included in unproved properties requires management 's judgment of exploratory costs related to drilling activity in a given area . drilling activities in an area by other companies may also effectively condemn leasehold positions . 63 reserve estimates while we are reasonably certain of recovering our reported reserves , the company 's estimates of natural gas and oil reserves are , by necessity , projections based on geologic and engineering data , and there are uncertainties inherent in the interpretation of such data as well as the projection of future rates of production and the timing of development expenditures . reserve engineering is a subjective process of estimating underground accumulations of natural gas and oil that are difficult to measure . the accuracy of any reserve estimate is a function of the quality of available data , engineering and geological interpretation and judgment . estimates of economically recoverable natural gas and oil reserves and future net cash flows necessarily depend upon a number of variable factors and assumptions , such as historical production from the area compared with production from other producing areas , the assumed effect of regulations by governmental agencies , and assumptions governing future natural gas and oil prices , future operating costs , severance taxes , development costs and workover costs , all of which may in fact vary considerably from actual results . the future development costs associated with reserves assigned to proved undeveloped locations may ultimately increase to the extent that these reserves are later determined to be uneconomic . for these reasons , estimates of the economically recoverable quantities of expected natural gas and oil attributable to any particular group of properties , classifications of such reserves based on risk of recovery , and estimates of the future net cash flows may vary substantially . any significant variance in the assumptions could materially affect the estimated quantity and value of the reserves , which could affect the carrying value of the company 's natural gas and oil properties and or the rate of depletion of such natural gas and oil properties . actual production , revenues and expenditures with respect to the company 's reserves will likely vary from estimates , and such variances may be material . holding all other factors constant , a reduction in the company 's proved reserve estimate at december 31 , 2017 of 5 % , 10 % and 15 % would affect depreciation , depletion and amortization expense by approximately $ 0.6 million , $ 1.2 million and $ 1.9 million , respectively . impairment of natural gas and oil properties the company reviews its proved natural gas and oil properties for impairment whenever events and circumstances , such as the current low commodity price environment , indicate a potential decline in the recoverability of their carrying value . an impairment loss associated with an asset group is the amount by which the carrying amount of a long-lived asset is not recoverable and exceeds its fair value . an asset 's fair value is preferably indicated by a quoted market price in the asset 's principal market . unlike many businesses where independent appraisals can be obtained for items such as equipment , oil and gas proved reserves are unique assets . most oil and gas valuations are based on a combination of the income approach and market approach methodologies . we utilize the income approach also known as the discounted cash flow ( “ dcf ” ) approach . under the dcf method in determining fair value , there are specific guidelines and ranges within the evaluation that we can consider and estimate . the company compares expected undiscounted future net cash flows from each field to the unamortized capitalized cost of the asset . if the future undiscounted net cash flows , based on the company 's estimate of future natural gas and oil prices and operating costs and anticipated production from proved reserves , are lower than the unamortized capitalized cost , then the capitalized cost is reduced to fair market value . the factors used to determine fair value include , but are not limited to , estimates of reserves , future commodity pricing , future production estimates , and anticipated capital expenditures . unproved properties are reviewed quarterly to determine if there has been impairment of the carrying value , with any such impairment charged to expense in the period . drilling

capital resources and liquidity our primary cash requirements are for capital expenditures , working capital , operating expenses , acquisitions and principal and interest payments on indebtedness . our primary sources of liquidity are cash generated by operations , net of the realized effect of our hedging agreements , and amounts available to be drawn under our credit facility . 60 the table below summarizes certain measures of liquidity and capital expenditures , as well as our sources of capital from internal and external sources , for the periods indicated , in thousands . replace_table_token_28_th cash flow from operating activities , including changes in working capital , provided approximately $ 34.7 million in cash for the year ended december 31 , 2017 compared to $ 32.0 million for the year ended december 31 , 2016. the changes in working capital were approximately $ 5.1 million during 2017 , compared to $ 7.8 million during 2016. cash flow from operating activities , excluding changes in working capital , provided approximately $ 29.6 million in cash for the year ended december 31 , 2017 compared to $ 24.2 million for the year ended december 31 , 2016. this increase in cash provided by operating activities was primarily attributable to higher revenues associated with higher prices , partially offset by lower production . cash flow from operating activities , including changes in working capital , provided approximately $ 32.0 million in cash for the year ended december 31 , 2016 compared to $ 25.0 million for the year ended december 31 , 2015. the changes in working capital were approximately $ 7.8 million during 2016 , compared to a deficit in 2015 of approximately $ 27.2 million .


 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.
     ```capital resources and liquidity our primary cash requirements are for capital expenditures , working capital , operating expenses , acquisitions and principal and interest payments on indebtedness . our primary sources of liquidity are cash generated by operations , net of the realized effect of our hedging agreements , and amounts available to be drawn under our credit facility . 60 the table below summarizes certain measures of liquidity and capital expenditures , as well as our sources of capital from internal and external sources , for the periods indicated , in thousands . replace_table_token_28_th cash flow from operating activities , including changes in working capital , provided approximately $ 34.7 million in cash for the year ended december 31 , 2017 compared to $ 32.0 million for the year ended december 31 , 2016. the changes in working capital were approximately $ 5.1 million during 2017 , compared to $ 7.8 million during 2016. cash flow from operating activities , excluding changes in working capital , provided approximately $ 29.6 million in cash for the year ended december 31 , 2017 compared to $ 24.2 million for the year ended december 31 , 2016. this increase in cash provided by operating activities was primarily attributable to higher revenues associated with higher prices , partially offset by lower production . cash flow from operating activities , including changes in working capital , provided approximately $ 32.0 million in cash for the year ended december 31 , 2016 compared to $ 25.0 million for the year ended december 31 , 2015. the changes in working capital were approximately $ 7.8 million during 2016 , compared to a deficit in 2015 of approximately $ 27.2 million .
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 Suspicious Activity Report : revenues and profitability our revenues , profitability and future growth depend substantially on our ability to find , develop and acquire natural gas and oil reserves that are economically recoverable , as well as prevailing prices for natural gas and oil . reserve replacement generally , producing properties offshore in the gulf of mexico have high initial production rates , followed by steep declines . likewise , initial production rates on new wells in the onshore resource plays start out at a relatively high rate with a decline curve which results in 60 % to 70 % of the ultimate recovery of present value occurring in the first eighteen months of the well 's life . we must locate and develop , or acquire , new natural gas and oil reserves to replace those being depleted by production . substantial capital expenditures are required to find , develop and or acquire natural gas and oil reserves . a prolonged period of depressed commodity prices could have a significant impact on the value and volumetric quantities of our proved reserve portfolio , assuming no other changes in our development plans . the merger with crimson allowed the company to add significant proved developed and undeveloped reserves and provided the company with access to several onshore resource plays which have substantial reserve growth potential , including in oil and liquids rich plays that position us to move to a more balanced oil/gas profile . use of estimates the preparation of our financial statements requires the use of estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements , and the reported amounts of revenues and expenses during the reporting periods . actual results could differ from those estimates . significant estimates with regard to these financial statements include estimates of remaining proved natural gas and oil reserves , the timing and costs of our future drilling , development and abandonment activities , and income taxes . see “ item 1a . risk factors ” for a more detailed discussion of a number of other factors that affect our business , financial condition and results of operations . 54 results of operations the table below sets forth our average net daily production data in mmcfe/d from our fields for each of the periods indicated : replace_table_token_24_th ( 1 ) includes a 26 day shut in for compressor repair during the three months ended march 31 , 2017 ( 2 ) includes a decreased production rate of 0.8 mmcfe/d due to temporary pipeline limitations during the three months ended june 30 , 2017 . ( 3 ) south timbalier 17 ceased production in august 2017 . ( 4 ) includes woodbine production from madison and grimes counties and conventional production in others . ( 5 ) includes eagle ford and buda production from karnes , zavala and dimmit counties , and conventional production in others . ( 6 ) includes onshore wells primarily in colorado , east texas , and wyoming during 2016 and onshore wells primarily in east texas and wyoming during 2017 . 55 year ended december 31 , 2017 compared to year ended december 31 , 2016 ; and year ended december 31 , 2016 compared to year ended december 31 , 2015 the table below sets forth revenue , production data , average sales prices and average production costs associated with our sales of natural gas , oil and natural gas liquids ( `` ngls `` ) from continuing operations for the years ended december 31 , 2017 , 2016 and 2015. oil , condensate and ngls are compared with natural gas in terms of cubic feet of natural gas equivalents . one barrel of oil , condensate or ngl is the energy equivalent of six mcf of natural gas . reported operating expenses include production taxes , such as ad valorem and severance . replace_table_token_25_th 56 replace_table_token_26_th 57 natural gas , oil and ngl sales and production all of our revenues are from the sale of our natural gas , crude oil and natural gas liquids production . our revenues may vary significantly from year to year depending on changes in commodity prices , which fluctuate widely , and production volumes . our production volumes are subject to wide swings as a result of new discoveries , weather and mechanical related problems . in addition , the production rate associated with our oil and gas properties declines over time as we produce our reserves . we reported revenues of approximately $ 78.5 million for the year ended december 31 , 2017 , compared to revenues of approximately $ 78.2 million for the year ended december 31 , 2016. this slight increase in revenues was primarily attributable to higher oil and natural gas prices in 2017 , which offset the decline in production caused by only adding five new producing wells in the southern delaware basin since late 2016 and minor non-core property sales . total production for the year ended december 31 , 2017 was approximately 20.1 bcfe , or 55.1 mmcfe/d , compared to approximately 26.0 bcfe , or 71.0 mmcfe/d , in the prior year . the decrease was attributable to a 6.7 mmcfe/d decline in production resulting from normal field decline and a limited 2016 drilling program , a 1.2 mmcfe/d decline due to non-core property sales , a 0.4 mmcfe/d decline from downtime associated with the impact of hurricane harvey , and a 0.2 mmcfe/d decline due to temporary pipeline limitations at the vermillion 170 field . the decrease in production was partially offset by 2.6 mmcfe/d of new production from drilling on our southern delaware basin acreage . story_separator_special_tag the company believes the following critical accounting policies affect its more significant judgments and estimates used in the preparation of the company 's consolidated financial statements : oil and gas properties - successful efforts our application of the successful efforts method of accounting for our natural gas and oil exploration and production activities requires judgments as to whether particular wells are developmental or exploratory , since exploratory costs and the costs related to exploratory wells that are determined to not have proved reserves must be expensed whereas developmental costs are capitalized . the results from a drilling operation can take considerable time to analyze , and the determination that commercial reserves have been discovered requires both judgment and application of industry experience . wells may be completed that are assumed to be productive and actually deliver natural gas and oil in quantities insufficient to be economic , which may result in the abandonment of the wells at a later date . on occasion , wells are drilled which have targeted geologic structures that are both developmental and exploratory in nature , and in such instances an allocation of costs is required to properly account for the results . delineation seismic costs incurred to select development locations within a productive natural gas and oil field are typically treated as development costs and capitalized , but often these seismic programs extend beyond the proved reserve areas and therefore management must estimate the portion of seismic costs to expense as exploratory . the evaluation of natural gas and oil leasehold acquisition costs included in unproved properties requires management 's judgment of exploratory costs related to drilling activity in a given area . drilling activities in an area by other companies may also effectively condemn leasehold positions . 63 reserve estimates while we are reasonably certain of recovering our reported reserves , the company 's estimates of natural gas and oil reserves are , by necessity , projections based on geologic and engineering data , and there are uncertainties inherent in the interpretation of such data as well as the projection of future rates of production and the timing of development expenditures . reserve engineering is a subjective process of estimating underground accumulations of natural gas and oil that are difficult to measure . the accuracy of any reserve estimate is a function of the quality of available data , engineering and geological interpretation and judgment . estimates of economically recoverable natural gas and oil reserves and future net cash flows necessarily depend upon a number of variable factors and assumptions , such as historical production from the area compared with production from other producing areas , the assumed effect of regulations by governmental agencies , and assumptions governing future natural gas and oil prices , future operating costs , severance taxes , development costs and workover costs , all of which may in fact vary considerably from actual results . the future development costs associated with reserves assigned to proved undeveloped locations may ultimately increase to the extent that these reserves are later determined to be uneconomic . for these reasons , estimates of the economically recoverable quantities of expected natural gas and oil attributable to any particular group of properties , classifications of such reserves based on risk of recovery , and estimates of the future net cash flows may vary substantially . any significant variance in the assumptions could materially affect the estimated quantity and value of the reserves , which could affect the carrying value of the company 's natural gas and oil properties and or the rate of depletion of such natural gas and oil properties . actual production , revenues and expenditures with respect to the company 's reserves will likely vary from estimates , and such variances may be material . holding all other factors constant , a reduction in the company 's proved reserve estimate at december 31 , 2017 of 5 % , 10 % and 15 % would affect depreciation , depletion and amortization expense by approximately $ 0.6 million , $ 1.2 million and $ 1.9 million , respectively . impairment of natural gas and oil properties the company reviews its proved natural gas and oil properties for impairment whenever events and circumstances , such as the current low commodity price environment , indicate a potential decline in the recoverability of their carrying value . an impairment loss associated with an asset group is the amount by which the carrying amount of a long-lived asset is not recoverable and exceeds its fair value . an asset 's fair value is preferably indicated by a quoted market price in the asset 's principal market . unlike many businesses where independent appraisals can be obtained for items such as equipment , oil and gas proved reserves are unique assets . most oil and gas valuations are based on a combination of the income approach and market approach methodologies . we utilize the income approach also known as the discounted cash flow ( “ dcf ” ) approach . under the dcf method in determining fair value , there are specific guidelines and ranges within the evaluation that we can consider and estimate . the company compares expected undiscounted future net cash flows from each field to the unamortized capitalized cost of the asset . if the future undiscounted net cash flows , based on the company 's estimate of future natural gas and oil prices and operating costs and anticipated production from proved reserves , are lower than the unamortized capitalized cost , then the capitalized cost is reduced to fair market value . the factors used to determine fair value include , but are not limited to , estimates of reserves , future commodity pricing , future production estimates , and anticipated capital expenditures . unproved properties are reviewed quarterly to determine if there has been impairment of the carrying value , with any such impairment charged to expense in the period . drilling

