Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Dec. 31, 2015 |
|
| Condensed Income Statements Captions [Line Items] | |||||
| Revenues | $ 99,655 | $ 149,066 | $ 177,370 | $ 276,973 | |
| Operating costs and expenses: | |||||
| Lease operating expenses | 36,622 | 45,130 | 81,091 | 98,461 | |
| Production taxes | 370 | 1,000 | 896 | 1,637 | |
| Gathering and transportation | 6,398 | 4,793 | 11,490 | 9,617 | |
| Depreciation, depletion, amortization and accretion | 57,493 | 103,342 | 121,226 | 228,809 | |
| Ceiling test write-down of oil and natural gas properties | 104,592 | 252,772 | 221,151 | 513,162 | $ 987,200 |
| General and administrative expenses | 16,235 | 19,757 | 32,678 | 40,523 | |
| Derivative loss | 4,942 | 1,078 | 2,449 | 1,078 | |
| Total costs and expenses | 226,652 | 427,872 | 470,981 | 893,287 | |
| Operating income (loss) | (126,997) | (278,806) | (293,611) | (616,314) | |
| Interest expense: | |||||
| Incurred | 29,773 | 26,116 | 57,587 | 49,062 | |
| Capitalized | (102) | (2,024) | (445) | (3,807) | |
| Other expense, net | (24) | 1,685 | 1,282 | 1,683 | |
| Income (loss) before income tax expense (benefit) | (156,644) | (304,583) | (352,035) | (663,252) | |
| Income tax benefit | (35,722) | (44,134) | (40,604) | (147,708) | |
| Net income (loss) | (120,922) | (260,449) | (311,431) | (515,544) | |
| Parent Company | |||||
| Condensed Income Statements Captions [Line Items] | |||||
| Revenues | 43,914 | 90,465 | 74,426 | 167,808 | |
| Operating costs and expenses: | |||||
| Lease operating expenses | 19,254 | 30,104 | 44,199 | 67,742 | |
| Production taxes | 370 | 1,000 | 896 | 1,637 | |
| Gathering and transportation | 2,469 | 2,769 | 4,022 | 5,334 | |
| Depreciation, depletion, amortization and accretion | 22,648 | 58,023 | 43,271 | 129,374 | |
| Ceiling test write-down of oil and natural gas properties | 181,300 | 371,995 | |||
| General and administrative expenses | 7,360 | 10,856 | 13,973 | 22,615 | |
| Derivative loss | 4,942 | 1,078 | 2,449 | 1,078 | |
| Total costs and expenses | 57,043 | 285,130 | 108,810 | 599,775 | |
| Operating income (loss) | (13,129) | (194,665) | (34,384) | (431,967) | |
| Earnings (loss) of affiliates | (40,765) | (54,548) | (113,794) | (119,552) | |
| Interest expense: | |||||
| Incurred | 29,735 | 25,322 | 57,430 | 47,554 | |
| Capitalized | (64) | (1,230) | (288) | (2,299) | |
| Other expense, net | (24) | 1,685 | 1,282 | 1,683 | |
| Income (loss) before income tax expense (benefit) | (83,541) | (274,990) | (206,602) | (598,457) | |
| Income tax benefit | (35,114) | (14,541) | (38,790) | (82,913) | |
| Net income (loss) | (48,427) | (260,449) | (167,812) | (515,544) | |
| Guarantor Subsidiaries | |||||
| Condensed Income Statements Captions [Line Items] | |||||
| Revenues | 55,741 | 58,601 | 102,944 | 109,165 | |
| Operating costs and expenses: | |||||
| Lease operating expenses | 17,368 | 15,026 | 36,892 | 30,719 | |
| Gathering and transportation | 3,929 | 2,024 | 7,468 | 4,283 | |
| Depreciation, depletion, amortization and accretion | 31,934 | 45,319 | 70,095 | 99,435 | |
| Ceiling test write-down of oil and natural gas properties | 35,008 | 71,472 | 85,392 | 141,167 | |
| General and administrative expenses | 8,875 | 8,901 | 18,705 | 17,908 | |
| Total costs and expenses | 97,114 | 142,742 | 218,552 | 293,512 | |
| Operating income (loss) | (41,373) | (84,141) | (115,608) | (184,347) | |
| Interest expense: | |||||
| Incurred | 38 | 794 | 157 | 1,508 | |
| Capitalized | (38) | (794) | (157) | (1,508) | |
| Income (loss) before income tax expense (benefit) | (41,373) | (84,141) | (115,608) | (184,347) | |
| Income tax benefit | (608) | (29,593) | (1,814) | (64,795) | |
| Net income (loss) | (40,765) | (54,548) | (113,794) | (119,552) | |
| Eliminations | |||||
| Operating costs and expenses: | |||||
| Depreciation, depletion, amortization and accretion | 2,911 | 7,860 | |||
| Ceiling test write-down of oil and natural gas properties | 69,584 | 135,759 | |||
| Total costs and expenses | 72,495 | 143,619 | |||
| Operating income (loss) | (72,495) | (143,619) | |||
| Earnings (loss) of affiliates | 40,765 | 54,548 | 113,794 | 119,552 | |
| Interest expense: | |||||
| Income (loss) before income tax expense (benefit) | (31,730) | 54,548 | (29,825) | 119,552 | |
| Net income (loss) | $ (31,730) | $ 54,548 | $ (29,825) | $ 119,552 | |