Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
|
| Condensed Income Statements Captions [Line Items] | |||||
| Revenues | $ 107,403 | $ 126,228 | $ 284,773 | $ 403,201 | |
| Operating costs and expenses: | |||||
| Lease operating expenses | 37,520 | 45,039 | 118,611 | 143,500 | |
| Production taxes | 482 | 889 | 1,378 | 2,526 | |
| Gathering and transportation | 5,161 | 3,572 | 16,651 | 13,189 | |
| Depreciation, depletion, amortization and accretion | 51,500 | 97,329 | 172,726 | 326,138 | |
| Ceiling test write-down of oil and natural gas properties | 57,912 | 441,688 | 279,063 | 954,850 | $ 987,200 |
| General and administrative expenses | 12,692 | 16,515 | 45,370 | 57,038 | |
| Derivative (gain) loss | 412 | (10,231) | 2,861 | (9,153) | |
| Total costs and expenses | 165,679 | 594,801 | 636,660 | 1,488,088 | |
| Operating loss | (58,276) | (468,573) | (351,887) | (1,084,887) | |
| Interest expense: | |||||
| Incurred | 23,693 | 28,754 | 81,280 | 77,816 | |
| Capitalized | (75) | (2,203) | (520) | (6,010) | |
| Gain on exchange of debt | 123,960 | 123,960 | |||
| Other expense, net | (73) | 964 | 1,209 | 2,647 | |
| Income (loss) before income tax benefit | 42,139 | (496,088) | (309,896) | (1,159,340) | |
| Income tax expense (benefit) | (3,789) | (18,520) | (44,393) | (166,228) | |
| Net income (loss) | 45,928 | (477,568) | (265,503) | (993,112) | |
| Parent Company | |||||
| Condensed Income Statements Captions [Line Items] | |||||
| Revenues | 44,585 | 71,092 | 119,011 | 238,900 | |
| Operating costs and expenses: | |||||
| Lease operating expenses | 22,624 | 29,721 | 66,823 | 97,463 | |
| Production taxes | 482 | 889 | 1,378 | 2,526 | |
| Gathering and transportation | 2,103 | 1,712 | 6,125 | 7,046 | |
| Depreciation, depletion, amortization and accretion | 21,959 | 50,960 | 65,230 | 180,334 | |
| Ceiling test write-down of oil and natural gas properties | 28,305 | 244,952 | 28,305 | 616,947 | |
| General and administrative expenses | 5,417 | 8,590 | 19,390 | 31,205 | |
| Derivative (gain) loss | 412 | (10,231) | 2,861 | (9,153) | |
| Total costs and expenses | 81,302 | 326,593 | 190,112 | 926,368 | |
| Operating loss | (36,717) | (255,501) | (71,101) | (687,468) | |
| Earnings (loss) of affiliates | (16,925) | (129,061) | (130,719) | (248,613) | |
| Interest expense: | |||||
| Incurred | 23,666 | 27,911 | 81,096 | 75,465 | |
| Capitalized | (48) | (1,360) | (336) | (3,659) | |
| Gain on exchange of debt | 123,960 | 123,960 | |||
| Other expense, net | (73) | 964 | 1,209 | 2,647 | |
| Income (loss) before income tax benefit | 46,773 | (412,077) | (159,829) | (1,010,534) | |
| Income tax expense (benefit) | (3,125) | 65,491 | (41,915) | (17,422) | |
| Net income (loss) | 49,898 | (477,568) | (117,914) | (993,112) | |
| Guarantor Subsidiaries | |||||
| Condensed Income Statements Captions [Line Items] | |||||
| Revenues | 62,818 | 55,136 | 165,762 | 164,301 | |
| Operating costs and expenses: | |||||
| Lease operating expenses | 14,896 | 15,318 | 51,788 | 46,037 | |
| Gathering and transportation | 3,058 | 1,860 | 10,526 | 6,143 | |
| Depreciation, depletion, amortization and accretion | 29,861 | 46,369 | 99,956 | 145,804 | |
| Ceiling test write-down of oil and natural gas properties | 25,317 | 196,736 | 110,709 | 337,903 | |
| General and administrative expenses | 7,275 | 7,925 | 25,980 | 25,833 | |
| Total costs and expenses | 80,407 | 268,208 | 298,959 | 561,720 | |
| Operating loss | (17,589) | (213,072) | (133,197) | (397,419) | |
| Interest expense: | |||||
| Incurred | 27 | 843 | 184 | 2,351 | |
| Capitalized | (27) | (843) | (184) | (2,351) | |
| Income (loss) before income tax benefit | (17,589) | (213,072) | (133,197) | (397,419) | |
| Income tax expense (benefit) | (664) | (84,011) | (2,478) | (148,806) | |
| Net income (loss) | (16,925) | (129,061) | (130,719) | (248,613) | |
| Eliminations | |||||
| Operating costs and expenses: | |||||
| Depreciation, depletion, amortization and accretion | (320) | 7,540 | |||
| Ceiling test write-down of oil and natural gas properties | 4,290 | 140,049 | |||
| Total costs and expenses | 3,970 | 147,589 | |||
| Operating loss | (3,970) | (147,589) | |||
| Earnings (loss) of affiliates | 16,925 | 129,061 | 130,719 | 248,613 | |
| Interest expense: | |||||
| Income (loss) before income tax benefit | 12,955 | 129,061 | (16,870) | 248,613 | |
| Net income (loss) | $ 12,955 | $ 129,061 | $ (16,870) | $ 248,613 | |