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CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Statements of Operations) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues: |  |  |  |  |  |  |  |
Total revenues | $ 285,175,000 |  |  | $ 360,962,000 |  |  | $ 1,064,747,000 | $ 939,094,000
Costs and expenses: |  |  |  |  |  |  |  |
Lease operating expenses | 22,473,000 |  |  | 22,325,000 |  |  | 64,668,000 | 64,143,000
Production taxes | 6,565,000 |  |  | 9,348,000 |  |  | 22,584,000 | 23,861,000
Midstream gathering and processing expenses | 78,435,000 |  |  | 78,913,000 |  |  | 220,732,000 | 214,546,000
Depreciation, depletion and amortization | 145,490,000 |  |  | 119,915,000 |  |  | 388,874,000 | 352,848,000
Impairment of oil and natural gas properties | 35,647,000 |  |  | 0 |  |  | 35,647,000 | 0
General and administrative expenses | 14,659,000 |  |  | 15,848,000 |  |  | 39,482,000 | 42,955,000
Accretion expense | 747,000 |  |  | 1,037,000 |  |  | 3,173,000 | 3,056,000
Total costs and expenses | 304,016,000 |  |  | 247,386,000 |  |  | 775,160,000 | 701,409,000
(LOSS) INCOME FROM OPERATIONS | (18,841,000) |  |  | 113,576,000 |  |  | 289,587,000 | 237,685,000
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Interest expense | 34,095,000 |  |  | 33,253,000 |  |  | 103,095,000 | 100,922,000
Interest income | (338,000) |  |  | (92,000) |  |  | (649,000) | (162,000)
Gain on sale of equity method investments | 0 |  |  | (2,733,000) |  |  | 0 | (124,768,000)
Gain on debt extinguishment | (23,600,000) |  |  | 0 |  |  | (23,600,000) | 0
(Income) loss from equity method investments and investments in subsidiaries | 43,082,000 |  |  | (12,858,000) |  |  | 164,391,000 | (35,282,000)
Other expense | 3,194,000 |  |  | 856,000 |  |  | 3,757,000 | 485,000
Total other (income) expense | 56,433,000 |  |  | 18,426,000 |  |  | 246,994,000 | (58,805,000)
LOSS BEFORE INCOME TAXES | (75,274,000) |  |  | 95,150,000 |  |  | 42,593,000 | 296,490,000
INCOME TAX BENEFIT | (26,522,000) |  |  | 0 |  |  | (205,853,000) | (69,000)
NET LOSS | (48,752,000) | $ 234,956,000 | $ 62,242,000 | 95,150,000 | $ 111,319,000 | $ 90,090,000 | 248,446,000 | 296,559,000
Parent |  |  |  |  |  |  |  |
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Gain on debt extinguishment | (23,600,000) |  |  |  |  |  | (23,600,000) |
Guarantors |  |  |  |  |  |  |  |
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Gain on debt extinguishment | 0 |  |  |  |  |  | 0 |
Non-Guarantors |  |  |  |  |  |  |  |
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Gain on debt extinguishment | 0 |  |  |  |  |  | 0 |
Reportable legal entities | Parent |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |
Total revenues | 27,358,000 |  |  | 235,683,000 |  |  | 493,895,000 | 596,018,000
Costs and expenses: |  |  |  |  |  |  |  |
Lease operating expenses | (231,000) |  |  | 16,502,000 |  |  | 26,918,000 | 46,926,000
Production taxes | 36,000 |  |  | 4,505,000 |  |  | 6,117,000 | 13,309,000
Midstream gathering and processing expenses | 0 |  |  | 54,397,000 |  |  | 71,420,000 | 152,605,000
Depreciation, depletion and amortization | 2,699,000 |  |  | 119,914,000 |  |  | 201,263,000 | 352,846,000
Impairment of oil and natural gas properties | 0 |  |  |  |  |  | 0 |
General and administrative expenses | 27,218,000 |  |  | 16,314,000 |  |  | 56,195,000 | 45,100,000
Accretion expense | 0 |  |  | 812,000 |  |  | 1,389,000 | 2,397,000
Total costs and expenses | 29,722,000 |  |  | 212,444,000 |  |  | 363,302,000 | 613,183,000
(LOSS) INCOME FROM OPERATIONS | (2,364,000) |  |  | 23,239,000 |  |  | 130,593,000 | (17,165,000)
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Interest expense | 35,105,000 |  |  | 34,254,000 |  |  | 105,364,000 | 103,310,000
Interest income | (187,000) |  |  | (86,000) |  |  | (454,000) | (144,000)
Gain on sale of equity method investments |  |  |  | (2,733,000) |  |  |  | (28,349,000)
(Income) loss from equity method investments and investments in subsidiaries | 62,760,000 |  |  | (104,226,000) |  |  | 7,295,000 | (387,991,000)
Other expense | (1,168,000) |  |  | 880,000 |  |  | (605,000) | (481,000)
Total other (income) expense | 72,910,000 |  |  | (71,911,000) |  |  | 88,000,000 | (313,655,000)
LOSS BEFORE INCOME TAXES | (75,274,000) |  |  | 95,150,000 |  |  | 42,593,000 | 296,490,000
INCOME TAX BENEFIT | (26,522,000) |  |  | 0 |  |  | (205,853,000) | (69,000)
NET LOSS | (48,752,000) |  |  | 95,150,000 |  |  | 248,446,000 | 296,559,000
Reportable legal entities | Guarantors |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |
Total revenues | 257,817,000 |  |  | 125,279,000 |  |  | 570,852,000 | 343,076,000
Costs and expenses: |  |  |  |  |  |  |  |
Lease operating expenses | 22,704,000 |  |  | 5,823,000 |  |  | 37,750,000 | 17,217,000
Production taxes | 6,529,000 |  |  | 4,843,000 |  |  | 16,467,000 | 10,552,000
Midstream gathering and processing expenses | 78,435,000 |  |  | 24,516,000 |  |  | 149,312,000 | 61,941,000
Depreciation, depletion and amortization | 142,625,000 |  |  | 1,000 |  |  | 187,390,000 | 2,000
Impairment of oil and natural gas properties | 35,647,000 |  |  |  |  |  | 35,647,000 |
General and administrative expenses | (12,675,000) |  |  | (467,000) |  |  | (16,933,000) | (2,148,000)
Accretion expense | 747,000 |  |  | 225,000 |  |  | 1,784,000 | 659,000
Total costs and expenses | 274,012,000 |  |  | 34,941,000 |  |  | 411,417,000 | 88,223,000
(LOSS) INCOME FROM OPERATIONS | (16,195,000) |  |  | 90,338,000 |  |  | 159,435,000 | 254,853,000
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Interest expense | (1,010,000) |  |  | (1,001,000) |  |  | (2,269,000) | (2,388,000)
Interest income | (151,000) |  |  | (6,000) |  |  | (195,000) | (18,000)
Gain on sale of equity method investments |  |  |  | 0 |  |  |  | (96,419,000)
(Income) loss from equity method investments and investments in subsidiaries | 0 |  |  | (1,000) |  |  | 0 | (694,000)
Other expense | 3,362,000 |  |  | (24,000) |  |  | 3,362,000 | (34,000)
Total other (income) expense | 2,201,000 |  |  | (1,032,000) |  |  | 898,000 | (99,553,000)
LOSS BEFORE INCOME TAXES | (18,396,000) |  |  | 91,370,000 |  |  | 158,537,000 | 354,406,000
INCOME TAX BENEFIT | 0 |  |  | 0 |  |  | 0 | 0
NET LOSS | (18,396,000) |  |  | 91,370,000 |  |  | 158,537,000 | 354,406,000
Reportable legal entities | Non-Guarantors |  |  |  |  |  |  |  |
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 expenses | 0 |  |  | 0 |  |  | 0 | 0
Depreciation, depletion and amortization | 166,000 |  |  | 0 |  |  | 221,000 | 0
Impairment of oil and natural gas properties | 0 |  |  |  |  |  | 0 |
General and administrative expenses | 116,000 |  |  | 1,000 |  |  | 220,000 | 3,000
Accretion expense | 0 |  |  | 0 |  |  | 0 | 0
Total costs and expenses | 282,000 |  |  | 1,000 |  |  | 441,000 | 3,000
(LOSS) INCOME FROM OPERATIONS | (282,000) |  |  | (1,000) |  |  | (441,000) | (3,000)
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Interest expense | 0 |  |  | 0 |  |  | 0 | 0
Interest income | 0 |  |  | 0 |  |  | 0 | 0
Gain on sale of equity method investments |  |  |  | 0 |  |  |  | 0
(Income) loss from equity method investments and investments in subsidiaries | 40,000 |  |  | 275,000 |  |  | 379,000 | 833,000
Other expense | 0 |  |  | 0 |  |  | 0 | 0
Total other (income) expense | 40,000 |  |  | 275,000 |  |  | 379,000 | 833,000
LOSS BEFORE INCOME TAXES | (322,000) |  |  | (276,000) |  |  | (820,000) | (836,000)
INCOME TAX BENEFIT | 0 |  |  | 0 |  |  | 0 | 0
NET LOSS | (322,000) |  |  | (276,000) |  |  | (820,000) | (836,000)
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 expenses | 0 |  |  | 0 |  |  | 0 | 0
Depreciation, depletion and amortization | 0 |  |  | 0 |  |  | 0 | 0
Impairment of oil and natural gas properties | 0 |  |  |  |  |  | 0 |
General and administrative expenses | 0 |  |  | 0 |  |  | 0 | 0
Accretion expense | 0 |  |  | 0 |  |  | 0 | 0
Total costs and expenses | 0 |  |  | 0 |  |  | 0 | 0
(LOSS) INCOME FROM OPERATIONS | 0 |  |  | 0 |  |  | 0 | 0
OTHER EXPENSE (INCOME): |  |  |  |  |  |  |  |
Interest expense | 0 |  |  | 0 |  |  | 0 | 0
Interest income | 0 |  |  | 0 |  |  | 0 | 0
Gain on sale of equity method investments |  |  |  | 0 |  |  |  | 0
Gain on debt extinguishment | 0 |  |  |  |  |  | 0 |
(Income) loss from equity method investments and investments in subsidiaries | (19,718,000) |  |  | 91,094,000 |  |  | 156,717,000 | 352,570,000
Other expense | 1,000,000 |  |  | 0 |  |  | 1,000,000 | 1,000,000
Total other (income) expense | (18,718,000) |  |  | 91,094,000 |  |  | 157,717,000 | 353,570,000
LOSS BEFORE INCOME TAXES | 18,718,000 |  |  | (91,094,000) |  |  | (157,717,000) | (353,570,000)
INCOME TAX BENEFIT | 0 |  |  | 0 |  |  | 0 | 0
NET LOSS | $ 18,718,000 |  |  | $ (91,094,000) |  |  | $ (157,717,000) | $ (353,570,000)

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