historically , commodity prices have experienced significant fluctuations , and additional changes in commodity prices may affect the economic viability of , and our ability to fund , our drilling projects , as well as the economic valuation and economic recovery of oil , ngl and natural gas reserves . we have entered into a number of derivative contracts that have enabled us to offset a portion of the changes in our cash flow caused by price fluctuations for our sales of oil , ngl and natural gas as discussed in `` item 7a . quantitative and qualitative disclosures about market risk . `` our reserves as of december 31 , 2016 and 2015 are reported in three streams : oil , ngl and natural gas . our sales volumes , prices and reserves as of december 31 , 2014 were reported in two streams : crude oil and liquids-rich natural gas with the economic value of the ngl in our natural gas included in the wellhead natural gas price . this change impacts the comparability of 2016 and 2015 with 2014. our net book value of evaluated oil and natural gas properties did not exceed the full cost ceiling amount as of december 31 , 2016 , september 30 , 2016 or june 30 , 2016. our net book value of evaluated oil and natural gas properties exceeded the full cost ceiling amount as of march 31 , 2016 and as a result , we recorded a non-cash full cost ceiling impairment of $ 161.1 million . oil , ngl and natural gas prices have somewhat stabilized in comparison to prices during 2016. however , if these prices decline from the current levels or if adverse economic conditions occur ( such as increases in drilling production and or service costs ) we could incur future full cost ceiling impairments . see note 2.g to our consolidated financial statements included elsewhere in this annual report for prices used to value our reserves and additional discussion of our full cost impairments in the first quarter of 2016 and in prior periods . core area of operations the oil and liquids-rich permian basin is characterized by multiple target horizons , extensive production histories , long-lived reserves , high drilling success rates and high initial production rates . as of december 31 , 2016 , we had assembled 127,847 net acres in the permian basin . sources of our revenue our revenues are derived from the sale of produced oil , ngl and natural gas within the continental united states , the sale of purchased oil and providing midstream services to third parties . our revenues do not include the effects of derivatives . for the year ended december 31 , 2016 , our revenues were comprised of sales of 53 % produced oil , 10 % produced ngl , 9 % produced natural gas , 27 % purchased oil and 1 % midstream services . our oil , ngl and natural gas revenues may vary significantly from period to period as a result of changes in volumes of production and or changes in commodity prices . our sales of purchased oil revenue may vary due to changes in oil prices and market differentials . our midstream service revenues 58 may vary due to oil throughput fees and the level of services provided to third parties for ( i ) gathered natural gas , ( ii ) gas lift fees and ( iii ) water services . principal components of our cost structure lease operating expenses . these are daily costs incurred to bring oil , ngl and natural gas out of the ground and to market , together with the daily costs incurred to maintain our producing properties . such costs also include maintenance , repairs and non-routine workover expenses related to our oil and natural gas properties . production and ad valorem taxes . production taxes are paid on oil , ngl and natural gas sold based on a percentage of revenues from products sold at market prices or at fixed rates established by federal , state or local taxing authorities . we take full advantage of all credits and exemptions in our various taxing jurisdictions . in general , the production taxes we pay correlate to the changes in oil , ngl and natural gas revenues . ad valorem taxes are property taxes based on the assessed taxable value of our reserves attributed to our oil and natural gas properties . midstream service expenses . these are costs incurred to operate and maintain our ( i ) oil and natural gas gathering and transportation systems and related facilities , ( ii ) centralized oil storage tanks , ( iii ) natural gas lift , rig fuel and centralized compression infrastructure and ( iv ) water storage , recycling and transportation facilities . minimum volume commitments . we have committed to deliver for sale or transportation fixed volumes of product under certain contractual arrangements that specify the delivery of a fixed and determinable quantity . if not fulfilled , we are subject to deficiency payments . these commitments are normal and customary for our business . in certain instances , we have used spot market purchases to meet our commitments in certain locations or due to favorable pricing . management anticipates continuing this practice in the future . also , if our production is not sufficient to satisfy our delivery commitments , we can and may use spot market purchases to fulfill the commitments . costs of purchased oil . these are costs associated with purchasing oil from third parties and the transportation costs required to bring it to market . drilling rig fees . story_separator_special_tag these changes are mainly a result of our 2015 buyout of a minimum volume commitment to medallion related to natural gas gathering infrastructure constructed by medallion on acreage we do not plan to develop . see notes 12.d and 14 to our consolidated financial statements included elsewhere in this annual report for further discussion of our minimum volume commitments . costs of purchased oil . see `` —results of operations - midstream and marketing `` for a discussion of these expenses . general and administrative ( `` g & a `` ) . the table below shows the changes in the significant components of g & a expense for the periods presented : replace_table_token_20_th g & a expense , excluding stock-based compensation , net of amounts capitalized , decreased by $ 3.4 million , or 5 % , for the year ended december 31 , 2016 compared to 2015 . this change is primarily due to decreases in expenses related to our 2013 performance unit awards and professional fees , partially offset by an increase in salaries , benefits and bonuses , net of amounts capitalized . expense incurred for our 2013 performance unit awards was $ 4.1 million for the year ended december 31 , 2015. there was no comparable expense during the year ended december 31 , 2016 as these types of awards are no longer a part of our compensation at this time . the performance criteria of these awards were satisfied on december 31 , 2015 and paid during the first quarter of 2016. stock-based compensation , net of amounts capitalized , increased by $ 4.7 million , or 19 % , for the year ended december 31 , 2016 compared to 2015 . this increase is mainly due to the issuance of restricted stock awards , stock option awards and performance share awards during the year ended december 31 , 2016. for further discussion of our stock-based compensation , see note 6 to our consolidated financial statements included elsewhere in this annual report . g & a expense , excluding stock-based compensation , net of amounts capitalized , decreased by $ 17.0 million , or 21 % , for the year ended december 31 , 2015 compared to 2014. this change is primarily due to ( i ) professional fees paid to a consulting company in 2014 that was engaged to assist us with the optimization of our development operations , ( ii ) reduced personnel expenses as a result of the reduction in force ( the `` rif `` ) which occurred early in the first quarter of 2015 and ( iii ) our $ 3.0 million charitable contribution pledge expensed in 2014 , which will be paid in annual installments through 2024. these contributors are partially offset by an increase in the fair value of the 2013 performance unit awards as of december 31 , 2015 compared to 2014 , based on the performance of our stock price relative to the peer group specified in the award agreement and utilized in the forward-looking monte carlo simulation . stock-based compensation , net of amounts capitalized , increased by $ 1.4 million , or 6 % , for the year ended december 31 , 2015 compared to 2014 due to the varying service periods of our award types , partially offset by forfeitures of restricted stock awards and stock option awards as a result of the first-quarter 2015 rif . the fair values for each of our restricted stock awards issued were calculated based on the value of our stock price on the grant date in accordance with gaap and are being expensed on a straight-line basis over their associated requisite service periods . the fair values for each of our stock option awards were determined using a black-scholes valuation model in accordance with gaap and are being expensed on a straight-line basis over their associated four-year requisite service periods . 64 our performance share awards are accounted for as equity awards and are included in stock-based compensation expense . the fair values of the performance share awards issued were based on a projection of the performance of our stock price relative to a peer group , defined in each performance share awards ' agreement , utilizing a forward-looking monte carlo simulation . the fair values for each of our performance share awards will not be re-measured after their initial grant-date valuation and are being expensed on a straight-line basis over their associated three-year requisite service periods . our performance unit awards were accounted for as liability awards and settled in cash at the end of their requisite service periods . the fair value and corresponding liability related to the 2013 performance unit awards as of december 31 , 2015 was $ 6.4 million . the 2013 performance unit awards had a performance period of january 1 , 2013 to december 31 , 2015 and , as their performance criteria were satisfied , they were paid at $ 143.75 per unit during the first quarter of 2016. the fair value and corresponding liability related to the 2012 performance unit awards as of december 31 , 2014 was $ 2.7 million . the 2012 performance unit awards had a performance period of january 1 , 2012 to december 31 , 2014 and , as their performance criteria were satisfied , they were paid at $ 100 per unit during the first quarter of 2015. see notes 2.r and 6 to our consolidated financial statements included elsewhere in this annual report for additional information regarding our stock and performance-based compensation . restructuring expenses . for the year ended december 31 , 2015 , we incurred restructuring expenses of $ 6.0 million related to the first-quarter 2015 rif , which was undertaken to reduce expenses and better position ourselves for future operations in a low commodity price environment . no comparable expenses were recorded for the years ended december 31 , 2016 and 2014 . see note 13

cash flows provided by financing activities for the year ended december 31 , 2016 , our primary sources of cash provided by financing activities were the combined proceeds from our july 2016 equity offering and may 2016 equity offering of $ 276.1 million and borrowings on our senior secured credit facility of $ 239.7 million . the cash inflows were partially offset by the payments on our senior secured credit facility of $ 304.7 million . for the year ended december 31 , 2015 , net cash provided by financing activities was the result of proceeds from our march 2015 equity offering of $ 754.2 million , our issuance of our march 2023 notes of $ 350.0 million and borrowings on our senior secured credit facility of $ 310.0 million . the cash inflows were offset by the redemption of our january 2019 notes of 71 $ 576.2 million , payments on our senior secured credit facility of $ 475.0 million and payments for debt issuance costs totaling $ 6.8 million . for the year ended december 31 , 2014 , net cash provided by financing activities was the result of the issuance of our january 2022 notes of $ 450.0 million , borrowings of $ 300.0 million on our senior secured credit facility and proceeds from the exercise of employee stock options of $ 1.9 million . these cash inflows were partially offset by payments for debt issuance costs totaling $ 7.8 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.
     ```cash flows provided by financing activities for the year ended december 31 , 2016 , our primary sources of cash provided by financing activities were the combined proceeds from our july 2016 equity offering and may 2016 equity offering of $ 276.1 million and borrowings on our senior secured credit facility of $ 239.7 million . the cash inflows were partially offset by the payments on our senior secured credit facility of $ 304.7 million . for the year ended december 31 , 2015 , net cash provided by financing activities was the result of proceeds from our march 2015 equity offering of $ 754.2 million , our issuance of our march 2023 notes of $ 350.0 million and borrowings on our senior secured credit facility of $ 310.0 million . the cash inflows were offset by the redemption of our january 2019 notes of 71 $ 576.2 million , payments on our senior secured credit facility of $ 475.0 million and payments for debt issuance costs totaling $ 6.8 million . for the year ended december 31 , 2014 , net cash provided by financing activities was the result of the issuance of our january 2022 notes of $ 450.0 million , borrowings of $ 300.0 million on our senior secured credit facility and proceeds from the exercise of employee stock options of $ 1.9 million . these cash inflows were partially offset by payments for debt issuance costs totaling $ 7.8 million .
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 Suspicious Activity Report : historically , commodity prices have experienced significant fluctuations , and additional changes in commodity prices may affect the economic viability of , and our ability to fund , our drilling projects , as well as the economic valuation and economic recovery of oil , ngl and natural gas reserves . we have entered into a number of derivative contracts that have enabled us to offset a portion of the changes in our cash flow caused by price fluctuations for our sales of oil , ngl and natural gas as discussed in `` item 7a . quantitative and qualitative disclosures about market risk . `` our reserves as of december 31 , 2016 and 2015 are reported in three streams : oil , ngl and natural gas . our sales volumes , prices and reserves as of december 31 , 2014 were reported in two streams : crude oil and liquids-rich natural gas with the economic value of the ngl in our natural gas included in the wellhead natural gas price . this change impacts the comparability of 2016 and 2015 with 2014. our net book value of evaluated oil and natural gas properties did not exceed the full cost ceiling amount as of december 31 , 2016 , september 30 , 2016 or june 30 , 2016. our net book value of evaluated oil and natural gas properties exceeded the full cost ceiling amount as of march 31 , 2016 and as a result , we recorded a non-cash full cost ceiling impairment of $ 161.1 million . oil , ngl and natural gas prices have somewhat stabilized in comparison to prices during 2016. however , if these prices decline from the current levels or if adverse economic conditions occur ( such as increases in drilling production and or service costs ) we could incur future full cost ceiling impairments . see note 2.g to our consolidated financial statements included elsewhere in this annual report for prices used to value our reserves and additional discussion of our full cost impairments in the first quarter of 2016 and in prior periods . core area of operations the oil and liquids-rich permian basin is characterized by multiple target horizons , extensive production histories , long-lived reserves , high drilling success rates and high initial production rates . as of december 31 , 2016 , we had assembled 127,847 net acres in the permian basin . sources of our revenue our revenues are derived from the sale of produced oil , ngl and natural gas within the continental united states , the sale of purchased oil and providing midstream services to third parties . our revenues do not include the effects of derivatives . for the year ended december 31 , 2016 , our revenues were comprised of sales of 53 % produced oil , 10 % produced ngl , 9 % produced natural gas , 27 % purchased oil and 1 % midstream services . our oil , ngl and natural gas revenues may vary significantly from period to period as a result of changes in volumes of production and or changes in commodity prices . our sales of purchased oil revenue may vary due to changes in oil prices and market differentials . our midstream service revenues 58 may vary due to oil throughput fees and the level of services provided to third parties for ( i ) gathered natural gas , ( ii ) gas lift fees and ( iii ) water services . principal components of our cost structure lease operating expenses . these are daily costs incurred to bring oil , ngl and natural gas out of the ground and to market , together with the daily costs incurred to maintain our producing properties . such costs also include maintenance , repairs and non-routine workover expenses related to our oil and natural gas properties . production and ad valorem taxes . production taxes are paid on oil , ngl and natural gas sold based on a percentage of revenues from products sold at market prices or at fixed rates established by federal , state or local taxing authorities . we take full advantage of all credits and exemptions in our various taxing jurisdictions . in general , the production taxes we pay correlate to the changes in oil , ngl and natural gas revenues . ad valorem taxes are property taxes based on the assessed taxable value of our reserves attributed to our oil and natural gas properties . midstream service expenses . these are costs incurred to operate and maintain our ( i ) oil and natural gas gathering and transportation systems and related facilities , ( ii ) centralized oil storage tanks , ( iii ) natural gas lift , rig fuel and centralized compression infrastructure and ( iv ) water storage , recycling and transportation facilities . minimum volume commitments . we have committed to deliver for sale or transportation fixed volumes of product under certain contractual arrangements that specify the delivery of a fixed and determinable quantity . if not fulfilled , we are subject to deficiency payments . these commitments are normal and customary for our business . in certain instances , we have used spot market purchases to meet our commitments in certain locations or due to favorable pricing . management anticipates continuing this practice in the future . also , if our production is not sufficient to satisfy our delivery commitments , we can and may use spot market purchases to fulfill the commitments . costs of purchased oil . these are costs associated with purchasing oil from third parties and the transportation costs required to bring it to market . drilling rig fees . story_separator_special_tag these changes are mainly a result of our 2015 buyout of a minimum volume commitment to medallion related to natural gas gathering infrastructure constructed by medallion on acreage we do not plan to develop . see notes 12.d and 14 to our consolidated financial statements included elsewhere in this annual report for further discussion of our minimum volume commitments . costs of purchased oil . see `` —results of operations - midstream and marketing `` for a discussion of these expenses . general and administrative ( `` g & a `` ) . the table below shows the changes in the significant components of g & a expense for the periods presented : replace_table_token_20_th g & a expense , excluding stock-based compensation , net of amounts capitalized , decreased by $ 3.4 million , or 5 % , for the year ended december 31 , 2016 compared to 2015 . this change is primarily due to decreases in expenses related to our 2013 performance unit awards and professional fees , partially offset by an increase in salaries , benefits and bonuses , net of amounts capitalized . expense incurred for our 2013 performance unit awards was $ 4.1 million for the year ended december 31 , 2015. there was no comparable expense during the year ended december 31 , 2016 as these types of awards are no longer a part of our compensation at this time . the performance criteria of these awards were satisfied on december 31 , 2015 and paid during the first quarter of 2016. stock-based compensation , net of amounts capitalized , increased by $ 4.7 million , or 19 % , for the year ended december 31 , 2016 compared to 2015 . this increase is mainly due to the issuance of restricted stock awards , stock option awards and performance share awards during the year ended december 31 , 2016. for further discussion of our stock-based compensation , see note 6 to our consolidated financial statements included elsewhere in this annual report . g & a expense , excluding stock-based compensation , net of amounts capitalized , decreased by $ 17.0 million , or 21 % , for the year ended december 31 , 2015 compared to 2014. this change is primarily due to ( i ) professional fees paid to a consulting company in 2014 that was engaged to assist us with the optimization of our development operations , ( ii ) reduced personnel expenses as a result of the reduction in force ( the `` rif `` ) which occurred early in the first quarter of 2015 and ( iii ) our $ 3.0 million charitable contribution pledge expensed in 2014 , which will be paid in annual installments through 2024. these contributors are partially offset by an increase in the fair value of the 2013 performance unit awards as of december 31 , 2015 compared to 2014 , based on the performance of our stock price relative to the peer group specified in the award agreement and utilized in the forward-looking monte carlo simulation . stock-based compensation , net of amounts capitalized , increased by $ 1.4 million , or 6 % , for the year ended december 31 , 2015 compared to 2014 due to the varying service periods of our award types , partially offset by forfeitures of restricted stock awards and stock option awards as a result of the first-quarter 2015 rif . the fair values for each of our restricted stock awards issued were calculated based on the value of our stock price on the grant date in accordance with gaap and are being expensed on a straight-line basis over their associated requisite service periods . the fair values for each of our stock option awards were determined using a black-scholes valuation model in accordance with gaap and are being expensed on a straight-line basis over their associated four-year requisite service periods . 64 our performance share awards are accounted for as equity awards and are included in stock-based compensation expense . the fair values of the performance share awards issued were based on a projection of the performance of our stock price relative to a peer group , defined in each performance share awards ' agreement , utilizing a forward-looking monte carlo simulation . the fair values for each of our performance share awards will not be re-measured after their initial grant-date valuation and are being expensed on a straight-line basis over their associated three-year requisite service periods . our performance unit awards were accounted for as liability awards and settled in cash at the end of their requisite service periods . the fair value and corresponding liability related to the 2013 performance unit awards as of december 31 , 2015 was $ 6.4 million . the 2013 performance unit awards had a performance period of january 1 , 2013 to december 31 , 2015 and , as their performance criteria were satisfied , they were paid at $ 143.75 per unit during the first quarter of 2016. the fair value and corresponding liability related to the 2012 performance unit awards as of december 31 , 2014 was $ 2.7 million . the 2012 performance unit awards had a performance period of january 1 , 2012 to december 31 , 2014 and , as their performance criteria were satisfied , they were paid at $ 100 per unit during the first quarter of 2015. see notes 2.r and 6 to our consolidated financial statements included elsewhere in this annual report for additional information regarding our stock and performance-based compensation . restructuring expenses . for the year ended december 31 , 2015 , we incurred restructuring expenses of $ 6.0 million related to the first-quarter 2015 rif , which was undertaken to reduce expenses and better position ourselves for future operations in a low commodity price environment . no comparable expenses were recorded for the years ended december 31 , 2016 and 2014 . see note 13

