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Supplementary Information (Tables) | 12 Months Ended
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Dec. 31, 2013
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, 2013 and 2012 (Unaudited)
|  | As of December 31, |
(Thousands of dollars) |  | 2013 |  |  | 2012 |
Proved Developed oil and gas properties |  | $ | 362,186 |  |  | $ | 336,135 |
Proved Undeveloped oil and gas properties |  |  | 1,937 |  |  |  | 2,069 |
Unproved oil and gas properties |  |  | — |  |  |  | — |
Total Capitalized Costs |  |  | 364,123 |  |  |  | 338,204 |
Accumulated depreciation, depletion and valuation allowance |  |  | 169,100 |  |  |  | 150,276 |
Net Capitalized Costs |  | $ | 195,023 |  |  | $ | 187,928 |
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, 2013 and 2012 (Unaudited)
|  | Year Ended December 31, |
(Thousands of dollars) |  | 2013 |  |  | 2012 |
Acquisition of Properties, Developed |  | $ | 7 |  |  | $ | 6,482 |
Acquisition of Properties, Undeveloped |  |  | — |  |  |  | 2,030 |
Exploration Costs |  |  | 8 |  |  |  | 10 |
Development Costs |  |  | 25,912 |  |  |  | 66,671 |
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, 2013 and 2012 (Unaudited)
|  | As of December 31, |
(Thousands of dollars) |  | 2013 |  |  | 2012 |
Future cash inflows |  | $ | 1,880,389 |  |  | $ | 1,524,137 |
Future production costs |  |  | (769,172 | ) |  |  | (673,629 | )
Future development costs |  |  | (313,754 | ) |  |  | (179,568 | )
Future income tax expenses |  |  | (234,191 | ) |  |  | (186,072 | )
Future Net Cash Flows |  |  | 563,272 |  |  |  | 484,868 |
10% annual discount for estimated timing of cash flows |  |  | (325,044 | ) |  |  | (271,595 | )
Standardized Measure of Discounted Future Net Cash Flows |  | $ | 238,228 |  |  | $ | 213,273 |
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 2013 and 2012:
|  | Year Ended December 31, |
(Thousands of dollars) |  | 2013 |  |  | 2012 |
Sales of oil and gas produced, net of production costs |  | $ | (48,976 | ) |  | $ | (48,673 | )
Net changes in prices and production costs |  |  | (10,149 | ) |  |  | 504 |
Extensions, discoveries and improved recovery |  |  | 218,648 |  |  |  | 164,557 |
Revisions of previous quantity estimates |  |  | (733 | ) |  |  | 40,964 |
Net change in development costs |  |  | (129,672 | ) |  |  | (145,382 | )
Reserves sold |  |  | — |  |  |  | — |
Reserves purchased |  |  | — |  |  |  | 6,563 |
Accretion of discount |  |  | 21,327 |  |  |  | 18,451 |
Net change in income taxes |  |  | (23,007 | ) |  |  | (5,952 | )
Changes in production rates (timing) and other |  |  | (2,483 | ) |  |  | (2,267 | )
Net change |  |  | 24,955 |  |  |  | 28,765 |
Standardized measure of discounted future net cash flow: |  |  |  |  |  |  |  |
Beginning of year |  |  | 213,273 |  |  |  | 184,508 |
End of year |  | $ | 238,228 |  |  | $ | 213,273 |
Reserve Quantity Information | RESERVE QUANTITY INFORMATION Years Ended December 31, 2013 and 2012 (Unaudited)
|  | As of December 31, |
|  | 2013 |  |  | 2012 |
|  | Oil (MBbls) |  |  | NGLs (MBbls) |  |  | Gas (MMcf) |  |  | Oil (MBbls) |  |  | NGLs (MBbls) |  |  | Gas (MMcf) |
Proved Developed Reserves: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 7,178 |  |  |  | 2,909 |  |  |  | 27,833 |  |  |  | 6,418 |  |  |  | — |  |  |  | 43,631 |
Extensions, discoveries and improved recovery |  |  | 87 |  |  |  | — |  |  |  | 402 |  |  |  | 224 |  |  |  | 49 |  |  |  | 1,000 |
Revisions of previous estimates |  |  | (361 | ) |  |  | (712 | ) |  |  | 6,456 |  |  |  | 252 |  |  |  | 2,860 |  |  |  | (15,821 | )
Converted from undeveloped reserves |  |  | 513 |  |  |  | 199 |  |  |  | 1,207 |  |  |  | 861 |  |  |  | — |  |  |  | 3,527 |
Reserves sold |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reserves purchased |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 168 |  |  |  | — |  |  |  | 211 |
Production |  |  | (730 | ) |  |  | (173 | ) |  |  | (4,270 | ) |  |  | (745 | ) |  |  | — |  |  |  | (4,715 | )
End of year |  |  | 6,687 |  |  |  | 2,223 |  |  |  | 31,628 |  |  |  | 7,178 |  |  |  | 2,909 |  |  |  | 27,833 |
Proved Undeveloped Reserves: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 5,907 |  |  |  | 2,877 |  |  |  | 12,613 |  |  |  | 2,435 |  |  |  | — |  |  |  | 9,765 |
Extensions, discoveries and improved recovery |  |  | 4,536 |  |  |  | 1,541 |  |  |  | 9,538 |  |  |  | 3,446 |  |  |  | 1,401 |  |  |  | 6,158 |
Revisions of previous estimates |  |  | 864 |  |  |  | (512 | ) |  |  | (1,172 | ) |  |  | 887 |  |  |  | 1,476 |  |  |  | 217 |
Converted to developed reserves |  |  | (513 | ) |  |  | 199 |  |  |  | (1,207 | ) |  |  | (861 | ) |  |  | — |  |  |  | (3,527 | )
Reserves sold |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reserves purchased |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
End of year |  |  | 9,066 |  |  |  | 3,707 |  |  |  | 19,772 |  |  |  | 5,907 |  |  |  | 2,877 |  |  |  | 12,613 |
Total Proved Reserves at the End of the Year |  |  | 15,753 |  |  |  | 5,930 |  |  |  | 51,400 |  |  |  | 13,085 |  |  |  | 5,786 |  |  |  | 40,446 |
Results of Operations from Oil and Gas Producing Activities | RESULTS OF OPERATIONS FROM OIL AND GAS PRODUCING ACTIVITIES Years Ended December 31, 2013 and 2012 (Unaudited)
|  | Year Ended December 31, |
(Thousands of dollars) |  | 2013 |  |  | 2012 |
Revenue: |  |  |  |  |  |  |  |
Oil and gas sales |  | $ | 92,785 |  |  | $ | 88,336 |
Costs and Expenses: |  |  |  |  |  |  |  |
Lease operating expenses |  |  | 43,809 |  |  |  | 39,868 |
Exploration costs |  |  | 8 |  |  |  | 10 |
Depreciation, depletion and accretion |  |  | 19,218 |  |  |  | 19,883 |
Income tax expense |  |  | 10,012 |  |  |  | 8,941 |
Total Costs and Expenses |  |  | 73,047 |  |  |  | 68,702 |
Results of Operations From Producing Activities (excluding corporate overhead and interest costs) |  | $ | 19,738 |  |  | $ | 19,634 |

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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 15 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61929-109447 Reference 2: 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=8451039&loc=d3e61926-109447 Reference 3: 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=8451751&loc=d3e63019-109448 Reference 4: 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=8451039&loc=d3e61901-109447 + Details
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- Definition Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451751&loc=d3e63042-109448 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62059-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Tabular disclosure of the results of operations for oil and gas producing activities for the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451751&loc=d3e63071-109448 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62352-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(17)(ii),(c)(3)(ii)(A)(1)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62259-109447 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62094-109447 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62395-109447 + Details
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- Definition Tabular disclosure of the aggregate change in the standardized measure of discounted future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchases under long-term agreements in which the enterprise participates in the operation of the properties on which oil and gas is located or otherwise serves as the producer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 36 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62536-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62496-109447 + Details
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- Definition Tabular disclosure of the net quantities of an enterprise's interests in proved developed and undeveloped reserves of (a) crude oil (including condensate and natural gas liquids), (b) natural gas (including coal bed methane), (c) synthetic oil, (d) synthetic gas, and (e) other nonrenewable natural resources that are intended to be upgraded during the period as of the beginning of the period, changes in quantities during the period, and as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61858-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61869-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61872-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447 + Details
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- Definition Tabular disclosure of the future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchase under long-term agreements in which the enterprise participates in the operation of the properties on which the oil and gas is located or otherwise serves as the producer. This information is presented in aggregate and for each geographic area for which reserve quantities are disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 36 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62536-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62479-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62455-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62476-109447 + Details
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