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Supplementary Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Capitalized Costs Relating to Oil and Gas Producing Activities | CAPITALIZED COSTS RELATING TO OIL AND GAS PRODUCING ACTIVITIES Years Ended December 31, 2015 and 2014 (Unaudited)
|  | As of December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Proved Developed oil and gas properties |  | $ | 395,129 |  |  | $ | 395,314 |
Proved Undeveloped oil and gas properties |  |  | — |  |  |  | 1,274 |
Total Capitalized Costs |  |  | 395,129 |  |  |  | 396,588 |
Accumulated depreciation, depletion and valuation allowance |  |  | 204,213 |  |  |  | 188,988 |
Net Capitalized Costs |  | $ | 190,916 |  |  | $ | 207,600 |
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities | COSTS INCURRED IN OIL AND GAS PROPERTY ACQUISITION, EXPLORATION AND DEVELOPMENT ACTIVITIES Years Ended December 31, 2015 and 2014 (Unaudited)
|  | Year Ended December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Acquisition of Properties, Developed |  |  | — |  |  | $ | 59 |
Development Costs |  | $ | 14,550 |  |  |  | 36,406 |
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves | STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS RELATING TO PROVED OIL AND GAS RESERVES Years Ended December 31, 2015 and 2014 (Unaudited)
|  | As of December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Future cash inflows |  | $ | 293,745 |  |  | $ | 2,252,248 |
Future production costs |  |  | (191,227 | ) |  |  | (738,531 | )
Future development costs |  |  | (30,586 | ) |  |  | (354,139 | )
Future income tax expenses |  |  | (4,815 | ) |  |  | (360,702 | )
Future Net Cash Flows |  |  | 67,117 |  |  |  | 798,876 |
10% annual discount for estimated timing of cash flows |  |  | (8,315 | ) |  |  | (455,588 | )
Standardized Measure of Discounted Future Net Cash Flows |  | $ | 58,802 |  |  | $ | 343,288 |
Standardized Measure of Discounted Future Net Cash Flows and Changes therein Relating to Proved Oil and Gas Reserves | The following are the principal sources of change in the standardized measure of discounted future net cash flows during 2015 and 2014:
|  | Year Ended December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Sales of oil and gas produced, net of production costs |  | $ | (10,426 | ) |  | $ | (47,074 | )
Net changes in prices and production costs |  |  | (511,116 | ) |  |  | (18,510 | )
Extensions, discoveries and improved recovery |  |  | 24,967 |  |  |  | 198,235 |
Revisions of previous quantity estimates |  |  | (180,048 | ) |  |  | 67,245 |
Net change in development costs |  |  | 235,285 |  |  |  | (69,923 | )
Reserves sold |  |  | (1,160 | ) |  |  | (69 | )
Reserves purchased |  |  | 737 |  |  |  | — |
Accretion of discount |  |  | 34,329 |  |  |  | 23,823 |
Net change in income taxes |  |  | 146,339 |  |  |  | (56,744 | )
Changes in production rates (timing) and other |  |  | (23,393 | ) |  |  | 8,077 |
Net change |  |  | (284,486 | ) |  |  | 105,060 |
Standardized measure of discounted future net cash flow: |  |  |  |  |  |  |  |
Beginning of year |  |  | 343,288 |  |  |  | 238,228 |
End of year |  | $ | 58,802 |  |  | $ | 343,288 |
Reserve Quantity Information | RESERVE QUANTITY INFORMATION Years Ended December 31, 2015 and 2014 (Unaudited)
|  | As of December 31, |
|  | 2015 |  |  | 2014 |
|  | Oil (MBbls) |  |  | NGLs (MBbls) |  |  | Gas (MMcf) |  |  | Oil (MBbls) |  |  | NGLs (MBbls) |  |  | Gas (MMcf) |
Proved Developed Reserves: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 6,239 |  |  |  | 2,160 |  |  |  | 32,267 |  |  |  | 6,687 |  |  |  | 2,223 |  |  |  | 31,628 |
Extensions, discoveries and improved recovery |  |  | 47 |  |  |  | 85 |  |  |  | 2,067 |  |  |  | 186 |  |  |  | 222 |  |  |  | 424 |
Revisions of previous estimates |  |  | (1,650 | ) |  |  | (560 | ) |  |  | (8,368 | ) |  |  | (278 | ) |  |  | (207 | ) |  |  | 3,662 |
Converted from undeveloped reserves |  |  | 677 |  |  |  | 163 |  |  |  | 944 |  |  |  | 407 |  |  |  | 93 |  |  |  | 735 |
Reserves sold |  |  | (53 | ) |  |  | — |  |  |  | (26 | ) |  |  | (4 | ) |  |  | — |  |  |  | — |
Reserves purchased |  |  | 39 |  |  |  | 12 |  |  |  | 372 |  |  |  | — |  |  |  | — |  |  |  | — |
Production |  |  | (720 | ) |  |  | (187 | ) |  |  | (3,981 | ) |  |  | (759 | ) |  |  | (171 | ) |  |  | (4,182 | )
End of year |  |  | 4,579 |  |  |  | 1,673 |  |  |  | 23,275 |  |  |  | 6,239 |  |  |  | 2,160 |  |  |  | 32,267 |
Proved Undeveloped Reserves: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 14,709 |  |  |  | 4,322 |  |  |  | 26,331 |  |  |  | 9,066 |  |  |  | 3,707 |  |  |  | 19,772 |
Extensions, discoveries and improved recovery |  |  | 420 |  |  |  | 101 |  |  |  | 701 |  |  |  | 5,914 |  |  |  | 1,629 |  |  |  | 6,672 |
Revisions of previous estimates |  |  | (14,400 | ) |  |  | (4,248 | ) |  |  | (26,033 | ) |  |  | 136 |  |  |  | (921 | ) |  |  | 622 |
Converted to developed reserves |  |  | (677 | ) |  |  | (163 | ) |  |  | (944 | ) |  |  | (407 | ) |  |  | (93 | ) |  |  | (735 | )
Reserves sold |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reserves purchased |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
End of year |  |  | 52 |  |  |  | 12 |  |  |  | 55 |  |  |  | 14,709 |  |  |  | 4,322 |  |  |  | 26,331 |
Total Proved Reserves at the End of the Year |  |  | 4,631 |  |  |  | 1,685 |  |  |  | 23,330 |  |  |  | 20,948 |  |  |  | 6,482 |  |  |  | 58,598 |
Results of Operations from Oil and Gas Producing Activities | RESULTS OF OPERATIONS FROM OIL AND GAS PRODUCING ACTIVITIES Years Ended December 31, 2015 and 2014 (Unaudited)
|  | Year Ended December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Revenue: |  |  |  |  |  |  |  |
Oil and gas sales |  | $ | 45,632 |  |  | $ | 91,045 |
Costs and Expenses: |  |  |  |  |  |  |  |
Lease operating expenses |  |  | 35,206 |  |  |  | 43,972 |
Depreciation, depletion and accretion |  |  | 28,531 |  |  |  | 22,906 |
Income tax (benefit) expense |  |  | (6,156 | ) |  |  | 9,216 |
Total Costs and Expenses |  |  | 57,581 |  |  |  | 76,094 |
Results of Operations From Producing Activities (excluding corporate overhead and interest costs) |  | $ | (11,949 | ) |  | $ | 14,951 |

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- Definition Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63019-109448 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61929-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61926-109447 + Details
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