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Condensed Consolidating Financial Information - Condensed Consolidating Statement of Operations (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Revenues: |  |  |  |
Total revenues | $ 70,434,000 | $ 66,325,000 | $ 125,434,000 | $ 131,786,000
Costs and expenses: |  |  |  |
Lease operating expenses | 5,878,000 | 5,714,000 | 11,050,000 | 11,563,000
Production taxes | 8,341,000 | 7,572,000 | 15,628,000 | 15,341,000
Depreciation, depletion, and amortization | 28,540,000 | 23,652,000 | 51,123,000 | 45,047,000
General and administrative | 4,900,000 | 3,263,000 | 9,312,000 | 6,272,000
Loss on sale of assets | 145,000 | 0 | 572,000 | 0
Accretion expense | 174,000 | 177,000 | 349,000 | 353,000
Total costs and expenses | 47,978,000 | 40,378,000 | 88,034,000 | 78,576,000
INCOME FROM OPERATIONS | 22,456,000 | 25,947,000 | 37,400,000 | 53,210,000
OTHER (INCOME) EXPENSE: |  |  |  |
Interest expense | 3,284,000 | 474,000 | 6,763,000 | 627,000
Interest income | (62,000) | (4,000) | (141,000) | (31,000)
(Income) loss from equity method investments | (50,108,000) | 360,000 | (111,318,000) | 628,000
Total Other (Income) Expense | 46,886,000 | (830,000) | 104,696,000 | (1,224,000)
INCOME BEFORE INCOME TAXES | 69,342,000 | 25,117,000 | 142,096,000 | 51,986,000
INCOME TAX EXPENSE | 25,514,000 | 0 | 53,709,000 | 0
NET INCOME | 43,828,000 | 25,117,000 | 88,387,000 | 51,986,000
Parent [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 70,033,000 | 65,938,000 | 124,695,000 | 131,103,000
Costs and expenses: |  |  |  |
Lease operating expenses | 5,714,000 | 5,573,000 | 10,712,000 | 11,218,000
Production taxes | 8,316,000 | 7,543,000 | 15,577,000 | 15,290,000
Depreciation, depletion, and amortization | 28,539,000 | 23,652,000 | 51,122,000 | 45,047,000
General and administrative | 4,859,000 | 3,240,000 | 9,237,000 | 6,204,000
Loss on sale of assets | 145,000 |  | 572,000 |
Accretion expense | 174,000 | 177,000 | 349,000 | 353,000
Total costs and expenses | 47,747,000 | 40,185,000 | 87,569,000 | 78,112,000
INCOME FROM OPERATIONS | 22,286,000 | 25,753,000 | 37,126,000 | 52,991,000
OTHER (INCOME) EXPENSE: |  |  |  |
Interest expense | 3,284,000 | 474,000 | 6,763,000 | 627,000
Interest income | (62,000) | (4,000) | (141,000) | (31,000)
(Income) loss from equity method investments | (50,278,000) | 166,000 | (111,592,000) | 409,000
Total Other (Income) Expense | 47,056,000 | (636,000) | 104,970,000 | (1,005,000)
INCOME BEFORE INCOME TAXES | 69,342,000 | 25,117,000 | 142,096,000 | 51,986,000
INCOME TAX EXPENSE | 25,514,000 | 0 | 53,709,000 | 0
NET INCOME | 43,828,000 | 25,117,000 | 88,387,000 | 51,986,000
Guarantor [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 401,000 | 387,000 | 739,000 | 683,000
Costs and expenses: |  |  |  |
Lease operating expenses | 164,000 | 141,000 | 338,000 | 345,000
Production taxes | 25,000 | 29,000 | 51,000 | 51,000
Depreciation, depletion, and amortization | 1,000 | 0 | 1,000 | 0
General and administrative | 38,000 | 22,000 | 72,000 | 42,000
Loss on sale of assets | 0 |  | 0 |
Accretion expense | 0 | 0 | 0 | 0
Total costs and expenses | 228,000 | 192,000 | 462,000 | 438,000
INCOME FROM OPERATIONS | 173,000 | 195,000 | 277,000 | 245,000
OTHER (INCOME) EXPENSE: |  |  |  |
Interest expense | 0 | 0 | 0 | 0
Interest income | 0 | 0 | 0 | 0
(Income) loss from equity method investments | 0 | 0 | 0 | 0
Total Other (Income) Expense | 0 | 0 | 0 | 0
INCOME BEFORE INCOME TAXES | 173,000 | 195,000 | 277,000 | 245,000
INCOME TAX EXPENSE | 0 | 0 | 0 | 0
NET INCOME | 173,000 | 195,000 | 277,000 | 245,000
Non-Guarantor [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Costs and expenses: |  |  |  |
Lease operating expenses | 0 | 0 | 0 | 0
Production taxes | 0 | 0 | 0 | 0
Depreciation, depletion, and amortization | 0 | 0 | 0 | 0
General and administrative | 3,000 | 1,000 | 3,000 | 26,000
Loss on sale of assets | 0 |  | 0 |
Accretion expense | 0 | 0 | 0 | 0
Total costs and expenses | 3,000 | 1,000 | 3,000 | 26,000
INCOME FROM OPERATIONS | (3,000) | (1,000) | (3,000) | (26,000)
OTHER (INCOME) EXPENSE: |  |  |  |
Interest expense | 0 | 0 | 0 | 0
Interest income | 0 | 0 | 0 | 0
(Income) loss from equity method investments | 730,000 | 306,000 | 1,262,000 | 584,000
Total Other (Income) Expense | (730,000) | (306,000) | (1,262,000) | (584,000)
INCOME BEFORE INCOME TAXES | (733,000) | (307,000) | (1,265,000) | (610,000)
INCOME TAX EXPENSE | 0 | 0 | 0 | 0
NET INCOME | (733,000) | (307,000) | (1,265,000) | (610,000)
Eliminations [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Costs and expenses: |  |  |  |
Lease operating expenses | 0 | 0 | 0 | 0
Production taxes | 0 | 0 | 0 | 0
Depreciation, depletion, and amortization | 0 | 0 | 0 | 0
General and administrative | 0 | 0 | 0 | 0
Loss on sale of assets | 0 |  | 0 |
Accretion expense | 0 | 0 | 0 | 0
Total costs and expenses | 0 | 0 | 0 | 0
INCOME FROM OPERATIONS | 0 | 0 | 0 | 0
OTHER (INCOME) EXPENSE: |  |  |  |
Interest expense | 0 | 0 | 0 | 0
Interest income | 0 | 0 | 0 | 0
(Income) loss from equity method investments | (560,000) | (112,000) | (988,000) | (365,000)
Total Other (Income) Expense | 560,000 | 112,000 | 988,000 | 365,000
INCOME BEFORE INCOME TAXES | 560,000 | 112,000 | 988,000 | 365,000
INCOME TAX EXPENSE | 0 | 0 | 0 | 0
NET INCOME | $ 560,000 | $ 112,000 | $ 988,000 | $ 365,000

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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