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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenues |  |  |  |
Oil and gas revenues | $ 218,633 | $ 159,337 | $ 455,885 | $ 276,652
Bulk oil sales | 8,091 | 0 | 35,722 | 0
Midstream revenues | 15,566 | 6,910 | 30,172 | 13,893
Well services revenues | 11,801 | 12,833 | 17,428 | 18,818
Total revenues | 254,091 | 179,080 | 539,207 | 309,363
Operating expenses |  |  |  |
Lease operating expenses | 44,665 | 31,523 | 88,537 | 62,587
Midstream operating expenses | 3,263 | 1,740 | 6,590 | 3,478
Well services operating expenses | 8,088 | 7,135 | 11,990 | 9,786
Marketing, transportation and gathering expenses | 12,039 | 6,491 | 22,990 | 15,043
Bulk oil purchases | 7,980 | 0 | 35,982 | 0
Production taxes | 18,971 | 14,367 | 39,270 | 25,120
Depreciation, depletion and amortization | 125,291 | 122,488 | 251,957 | 244,937
Exploration expenses | 1,667 | 340 | 3,156 | 703
Impairment | 3,200 | 23 | 5,882 | 3,585
General and administrative expenses | 23,548 | 21,876 | 47,382 | 46,242
Total operating expenses | 248,712 | 205,983 | 513,736 | 411,481
Loss on sale of properties | 0 | (1,311) | 0 | (1,311)
Operating income (loss) | 5,379 | (28,214) | 25,471 | (103,429)
Other income (expense) |  |  |  |
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Net gain (loss) on derivative instruments | 50,532 | (90,846) | 106,607 | (76,471)
Interest expense, net of capitalized interest | (36,838) | (34,979) | (73,159) | (73,718)
Gain on extinguishment of debt | 0 | 11,642 | 0 | 18,658
Other expense | (166) | (32) | (150) | 447
Total other income (expense) | 13,528 | (114,215) | 33,298 | (131,084)
Income (loss) before income taxes | 18,907 | (142,429) | 58,769 | (234,513)
Income tax benefit | (2,339) | 52,498 | (18,376) | 80,127
Net income (loss) | 16,568 | (89,931) | 40,393 | (154,386)
Intercompany Eliminations [Member] |  |  |  |
Revenues |  |  |  |
Oil and gas revenues | 0 | 0 | 0 | 0
Bulk oil sales | 0 |  | 0 |
Midstream revenues | 0 | 0 | 0 | 0
Well services revenues | 0 | 0 | 0 | 0
Total revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Lease operating expenses | 0 | 0 | 0 | 0
Midstream operating expenses | 0 | 0 | 0 | 0
Well services operating expenses | 0 | 0 | 0 | 0
Marketing, transportation and gathering expenses | 0 | 0 | 0 | 0
Bulk oil purchases | 0 |  | 0 |
Production taxes | 0 | 0 | 0 | 0
Depreciation, depletion and amortization | 0 | 0 | 0 | 0
Exploration expenses | 0 | 0 | 0 | 0
Impairment | 0 | 0 | 0 | 0
General and administrative expenses | 0 | 0 | 0 | 0
Total operating expenses | 0 | 0 | 0 | 0
Loss on sale of properties |  | 0 |  | 0
Operating income (loss) | 0 | 0 | 0 | 0
Other income (expense) |  |  |  |
Equity in earnings of subsidiaries | (38,875) | 71,987 | (87,978) | 109,314
Net gain (loss) on derivative instruments | 0 | 0 | 0 | 0
Interest expense, net of capitalized interest | 0 | 0 | 0 | 0
Gain on extinguishment of debt |  | 0 |  | 0
Other expense | 0 | 0 | 0 | 0
Total other income (expense) | (38,875) | 71,987 | (87,978) | 109,314
Income (loss) before income taxes | (38,875) | 71,987 | (87,978) | 109,314
Income tax benefit | 0 | 0 | 0 | 0
Net income (loss) | (38,875) | 71,987 | (87,978) | 109,314
Parent/Issuer [Member] |  |  |  |
Revenues |  |  |  |
Oil and gas revenues | 0 | 0 | 0 | 0
Bulk oil sales | 0 |  | 0 |
Midstream revenues | 0 | 0 | 0 | 0
Well services revenues | 0 | 0 | 0 | 0
Total revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Lease operating expenses | 0 | 0 | 0 | 0
Midstream operating expenses | 0 | 0 | 0 | 0
Well services operating expenses | 0 | 0 | 0 | 0
Marketing, transportation and gathering expenses | 0 | 0 | 0 | 0
Bulk oil purchases | 0 |  | 0 |
Production taxes | 0 | 0 | 0 | 0
Depreciation, depletion and amortization | 0 | 0 | 0 | 0
Exploration expenses | 0 | 0 | 0 | 0
Impairment | 0 | 0 | 0 | 0
General and administrative expenses | 7,534 | 6,395 | 14,599 | 13,846
Total operating expenses | 7,534 | 6,395 | 14,599 | 13,846
Loss on sale of properties |  | 0 |  | 0
Operating income (loss) | (7,534) | (6,395) | (14,599) | (13,846)
Other income (expense) |  |  |  |
Equity in earnings of subsidiaries | 38,875 | (71,987) | 87,978 | (109,314)
Net gain (loss) on derivative instruments | 0 | 0 | 0 | 0
Interest expense, net of capitalized interest | (33,006) | (33,190) | (65,857) | (68,022)
Gain on extinguishment of debt |  | 11,642 |  | 18,658
Other expense | 0 | 0 | 0 | 43
Total other income (expense) | 5,869 | (93,535) | 22,121 | (158,635)
Income (loss) before income taxes | (1,665) | (99,930) | 7,522 | (172,481)
Income tax benefit | 18,233 | 9,999 | 32,871 | 18,095
Net income (loss) | 16,568 | (89,931) | 40,393 | (154,386)
Combined Guarantor Subsidiaries [Member] |  |  |  |
Revenues |  |  |  |
Oil and gas revenues | 218,633 | 159,337 | 455,885 | 276,652
Bulk oil sales | 8,091 |  | 35,722 |
Midstream revenues | 15,566 | 6,910 | 30,172 | 13,893
Well services revenues | 11,801 | 12,833 | 17,428 | 18,818
Total revenues | 254,091 | 179,080 | 539,207 | 309,363
Operating expenses |  |  |  |
Lease operating expenses | 44,665 | 31,523 | 88,537 | 62,587
Midstream operating expenses | 3,263 | 1,740 | 6,590 | 3,478
Well services operating expenses | 8,088 | 7,135 | 11,990 | 9,786
Marketing, transportation and gathering expenses | 12,039 | 6,491 | 22,990 | 15,043
Bulk oil purchases | 7,980 |  | 35,982 |
Production taxes | 18,971 | 14,367 | 39,270 | 25,120
Depreciation, depletion and amortization | 125,291 | 122,488 | 251,957 | 244,937
Exploration expenses | 1,667 | 340 | 3,156 | 703
Impairment | 3,200 | 23 | 5,882 | 3,585
General and administrative expenses | 16,014 | 15,481 | 32,783 | 32,396
Total operating expenses | 241,178 | 199,588 | 499,137 | 397,635
Loss on sale of properties |  | (1,311) |  | (1,311)
Operating income (loss) | 12,913 | (21,819) | 40,070 | (89,583)
Other income (expense) |  |  |  |
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Net gain (loss) on derivative instruments | 50,532 | (90,846) | 106,607 | (76,471)
Interest expense, net of capitalized interest | (3,832) | (1,789) | (7,302) | (5,696)
Gain on extinguishment of debt |  | 0 |  | 0
Other expense | (166) | (32) | (150) | 404
Total other income (expense) | 46,534 | (92,667) | 99,155 | (81,763)
Income (loss) before income taxes | 59,447 | (114,486) | 139,225 | (171,346)
Income tax benefit | (20,572) | 42,499 | (51,247) | 62,032
Net income (loss) | $ 38,875 | $ (71,987) | $ 87,978 | $ (109,314)

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