Condensed Consolidating Financial Information (Condensed Consolidating Statements of Operations) (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Revenues | ||||
| Total revenues | $ 265,498,000 | $ 193,692,000 | $ 922,455,000 | $ 322,494,000 |
| Costs and expenses | ||||
| Lease operating expenses | 20,020,000 | 17,471,000 | 60,044,000 | 48,789,000 |
| Production taxes | 5,419,000 | 3,525,000 | 14,464,000 | 9,492,000 |
| Midstream gathering and processing | 69,372,000 | 45,475,000 | 176,258,000 | 122,476,000 |
| Depreciation, depletion and amortization | 106,650,000 | 62,285,000 | 254,887,000 | 183,414,000 |
| Impairment of oil and natural gas properties | 0 | 212,194,000 | 0 | 601,806,000 |
| General and administrative | 13,065,000 | 10,467,000 | 37,922,000 | 32,941,000 |
| Accretion expense | 456,000 | 269,000 | 1,148,000 | 777,000 |
| Acquisition expense | 33,000 | 0 | 2,391,000 | 0 |
| Total costs and expenses | 215,015,000 | 351,686,000 | 547,114,000 | 999,695,000 |
| INCOME (LOSS) FROM OPERATIONS | 50,483,000 | (157,994,000) | 375,341,000 | (677,201,000) |
| OTHER (INCOME) EXPENSE | ||||
| Interest expense | 27,130,000 | 12,787,000 | 74,797,000 | 44,892,000 |
| Interest income | (37,000) | (337,000) | (927,000) | (822,000) |
| Insurance Proceeds | 0 | (3,750,000) | 0 | (3,750,000) |
| (Income) loss from equity method investments and investments in subsidiaries | 2,737,000 | (5,997,000) | 20,945,000 | 25,576,000 |
| Other income | (345,000) | 6,000 | (863,000) | (3,000) |
| Total other (income) expense | 29,485,000 | 2,709,000 | 93,952,000 | 65,893,000 |
| INCOME (LOSS) BEFORE INCOME TAXES | 20,998,000 | (160,703,000) | 281,389,000 | (743,094,000) |
| INCOME TAX EXPENSE | 2,763,000 | (3,407,000) | 2,763,000 | (3,755,000) |
| NET INCOME (LOSS) | 18,235,000 | (157,296,000) | 278,626,000 | (739,339,000) |
| Reportable Legal Entities | Parent | ||||
| Revenues | ||||
| Total revenues | 188,390,000 | 193,227,000 | 710,184,000 | 321,404,000 |
| Costs and expenses | ||||
| Lease operating expenses | 16,019,000 | 17,283,000 | 49,891,000 | 48,246,000 |
| Production taxes | 4,052,000 | 3,495,000 | 10,799,000 | 9,410,000 |
| Midstream gathering and processing | 52,725,000 | 45,385,000 | 132,740,000 | 122,250,000 |
| Depreciation, depletion and amortization | 106,649,000 | 62,284,000 | 254,884,000 | 183,411,000 |
| Impairment of oil and natural gas properties | 212,194,000 | 601,806,000 | ||
| General and administrative | 13,956,000 | 10,772,000 | 39,882,000 | 33,230,000 |
| Accretion expense | 335,000 | 269,000 | 908,000 | 777,000 |
| Acquisition expense | (5,000) | 0 | ||
| Total costs and expenses | 193,731,000 | 351,682,000 | 489,104,000 | 999,130,000 |
| INCOME (LOSS) FROM OPERATIONS | (5,341,000) | (158,455,000) | 221,080,000 | (677,726,000) |
| OTHER (INCOME) EXPENSE | ||||
| Interest expense | 27,914,000 | 12,787,000 | 79,095,000 | 44,891,000 |
| Interest income | (29,000) | (337,000) | (913,000) | (822,000) |
| Insurance Proceeds | (3,750,000) | (3,750,000) | ||
| (Income) loss from equity method investments and investments in subsidiaries | (53,880,000) | (6,457,000) | (136,969,000) | 25,044,000 |
| Other income | (344,000) | 5,000 | (1,522,000) | 5,000 |
| Total other (income) expense | (26,339,000) | 2,248,000 | (60,309,000) | 65,368,000 |
| INCOME (LOSS) BEFORE INCOME TAXES | 20,998,000 | (160,703,000) | 281,389,000 | (743,094,000) |
| INCOME TAX EXPENSE | 2,763,000 | (3,407,000) | 2,763,000 | (3,755,000) |
| NET INCOME (LOSS) | 18,235,000 | (157,296,000) | 278,626,000 | (739,339,000) |
| Reportable Legal Entities | Guarantors | ||||
| Revenues | ||||
| Total revenues | 77,108,000 | 465,000 | 212,271,000 | 1,090,000 |
| Costs and expenses | ||||
| Lease operating expenses | 4,001,000 | 188,000 | 10,153,000 | 543,000 |
| Production taxes | 1,367,000 | 30,000 | 3,665,000 | 82,000 |
| Midstream gathering and processing | 16,647,000 | 90,000 | 43,518,000 | 226,000 |
| Depreciation, depletion and amortization | 1,000 | 1,000 | 3,000 | 3,000 |
| Impairment of oil and natural gas properties | 0 | 0 | ||
| General and administrative | (892,000) | (305,000) | (1,963,000) | (291,000) |
| Accretion expense | 121,000 | 0 | 240,000 | 0 |
| Acquisition expense | 38,000 | 2,391,000 | ||
| Total costs and expenses | 21,283,000 | 4,000 | 58,007,000 | 563,000 |
| INCOME (LOSS) FROM OPERATIONS | 55,825,000 | 461,000 | 154,264,000 | 527,000 |
| OTHER (INCOME) EXPENSE | ||||
| Interest expense | (784,000) | 0 | (4,298,000) | 1,000 |
| Interest income | (8,000) | 0 | (14,000) | 0 |
| Insurance Proceeds | 0 | 0 | ||
| (Income) loss from equity method investments and investments in subsidiaries | 128,000 | (99,000) | 2,586,000 | (40,000) |
| Other income | (1,000) | 1,000 | (241,000) | (8,000) |
| Total other (income) expense | (665,000) | (98,000) | (1,967,000) | (47,000) |
| INCOME (LOSS) BEFORE INCOME TAXES | 56,490,000 | 559,000 | 156,231,000 | 574,000 |
| INCOME TAX EXPENSE | 0 | 0 | 0 | 0 |
| NET INCOME (LOSS) | 56,490,000 | 559,000 | 156,231,000 | 574,000 |
| Reportable Legal Entities | Non-Guarantor | ||||
| Revenues | ||||
| Total revenues | 0 | 0 | 0 | 0 |
| Costs and expenses | ||||
| Lease operating expenses | 0 | 0 | 0 | 0 |
| Production taxes | 0 | 0 | 0 | 0 |
| Midstream gathering and processing | 0 | 0 | 0 | 0 |
| Depreciation, depletion and amortization | 0 | 0 | 0 | |
| Impairment of oil and natural gas properties | 0 | 0 | ||
| General and administrative | 1,000 | 0 | 3,000 | 2,000 |
| Accretion expense | 0 | 0 | 0 | 0 |
| Acquisition expense | 0 | 0 | ||
| Total costs and expenses | 1,000 | 0 | 3,000 | 2,000 |
| INCOME (LOSS) FROM OPERATIONS | (1,000) | 0 | (3,000) | (2,000) |
| OTHER (INCOME) EXPENSE | ||||
| Interest expense | 0 | 0 | 0 | 0 |
| Interest income | 0 | 0 | 0 | 0 |
| Insurance Proceeds | 0 | 0 | ||
| (Income) loss from equity method investments and investments in subsidiaries | 296,000 | 364,000 | 869,000 | 24,812,000 |
| Other income | 0 | 0 | 0 | |
| Total other (income) expense | 296,000 | 364,000 | 869,000 | 24,812,000 |
| INCOME (LOSS) BEFORE INCOME TAXES | (297,000) | (364,000) | (872,000) | (24,814,000) |
| INCOME TAX EXPENSE | 0 | 0 | 0 | 0 |
| NET INCOME (LOSS) | (297,000) | (364,000) | (872,000) | (24,814,000) |
| Eliminations | ||||
| Revenues | ||||
| Total revenues | 0 | 0 | 0 | 0 |
| Costs and expenses | ||||
| Lease operating expenses | 0 | 0 | 0 | 0 |
| Production taxes | 0 | 0 | 0 | 0 |
| Midstream gathering and processing | 0 | 0 | 0 | 0 |
| Depreciation, depletion and amortization | 0 | 0 | 0 | |
| Impairment of oil and natural gas properties | 0 | 0 | ||
| General and administrative | 0 | 0 | 0 | 0 |
| Accretion expense | 0 | 0 | 0 | 0 |
| Acquisition expense | 0 | 0 | ||
| Total costs and expenses | 0 | 0 | 0 | 0 |
| INCOME (LOSS) FROM OPERATIONS | 0 | 0 | 0 | 0 |
| OTHER (INCOME) EXPENSE | ||||
| Interest expense | 0 | 0 | 0 | 0 |
| Interest income | 0 | 0 | 0 | 0 |
| Insurance Proceeds | 0 | 0 | ||
| (Income) loss from equity method investments and investments in subsidiaries | 56,193,000 | 195,000 | 154,459,000 | (24,240,000) |
| Other income | 0 | 900,000 | 0 | |
| Total other (income) expense | 56,193,000 | 195,000 | 155,359,000 | (24,240,000) |
| INCOME (LOSS) BEFORE INCOME TAXES | (56,193,000) | (195,000) | (155,359,000) | 24,240,000 |
| INCOME TAX EXPENSE | 0 | 0 | 0 | 0 |
| NET INCOME (LOSS) | $ (56,193,000) | $ (195,000) | $ (155,359,000) | $ 24,240,000 |