| CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables)
 | 9 Months Ended | 
| Sep. 30, 2019 | 
|---|
| Condensed Financial Information Disclosure [Abstract] |  | 
| CONDENSED CONSOLIDATING BALANCE SHEETS | CONDENSED CONSOLIDATING BALANCE SHEETS 
(Amounts in thousands) 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | September 30, 2019 |  
|   | Parent |   | Guarantors |   | Non-Guarantors |   | Eliminations |   | Consolidated |  
|   | As Restated |  
| Assets |   |   |   |   |   |   |   |   |   |  
| Current assets: |   |   |   |   |   |   |   |   |   |  
| Cash and cash equivalents | $ | 6,279 | 
 |   | $ | 3,715 | 
 |   | $ | 130 | 
 |   | $ | — | 
 |   | $ | 10,124 | 
 |  
| Accounts receivable - oil and natural gas sales | 857 | 
 |   | 111,800 | 
 |   | — | 
 |   | — | 
 |   | 112,657 | 
 |  
| Accounts receivable - joint interest and other | 6,909 | 
 |   | 34,418 | 
 |   | — | 
 |   | — | 
 |   | 41,327 | 
 |  
| Accounts receivable - intercompany | 953,446 | 
 |   | 625,306 | 
 |   | — | 
 |   | (1,578,752 | ) |   | — | 
 |  
| Prepaid expenses and other current assets | 3,886 | 
 |   | 1,697 | 
 |   | 75 | 
 |   | — | 
 |   | 5,658 | 
 |  
| Short-term derivative instruments | 134,571 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 134,571 | 
 |  
| Total current assets | 1,105,948 | 
 |   | 776,936 | 
 |   | 205 | 
 |   | (1,578,752 | ) |   | 304,337 | 
 |  
| Property and equipment: |   |   |   |   |   |   |   |   |   |  
| Oil and natural gas properties, full-cost accounting | 1,312,715 | 
 |   | 9,239,581 | 
 |   | 146 | 
 |   | (729 | ) |   | 10,551,713 | 
 |  
| Other property and equipment | 92,163 | 
 |   | 751 | 
 |   | 3,319 | 
 |   | — | 
 |   | 96,233 | 
 |  
| Accumulated depletion, depreciation, amortization and impairment | (1,416,248 | ) |   | (4,200,519 | ) |   | (221 | ) |   | — | 
 |   | (5,616,988 | ) |  
| Property and equipment, net | (11,370 | ) |   | 5,039,813 | 
 |   | 3,244 | 
 |   | (729 | ) |   | 5,030,958 | 
 |  
| Other assets: |   |   |   |   |   |   |   |   |   |  
| Equity investments and investments in subsidiaries | 4,553,316 | 
 |   | — | 
 |   | 49,545 | 
 |   | (4,528,899 | ) |   | 73,962 | 
 |  
| Long-term derivative instruments | 23,419 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 23,419 | 
 |  
| Deferred tax asset | 323,378 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 323,378 | 
 |  
| Inventories | 94 | 
 |   | 6,928 | 
 |   | — | 
 |   | — | 
 |   | 7,022 | 
 |  
| Operating lease assets | 13,920 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 13,920 | 
 |  
| Operating lease assets - related parties | 48,449 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 48,449 | 
 |  
| Other assets | 11,333 | 
 |   | 320 | 
 |   | — | 
 |   | — | 
 |   | 11,653 | 
 |  
| Total other assets | 4,973,909 | 
 |   | 7,248 | 
 |   | 49,545 | 
 |   | (4,528,899 | ) |   | 501,803 | 
 |  
| Total assets | $ | 6,068,487 | 
 |   | $ | 5,823,997 | 
 |   | $ | 52,994 | 
 |   | $ | (6,108,380 | ) |   | $ | 5,837,098 | 
 |  
| 
Liabilities and Stockholders’ Equity
 |   |   |   |   |   |   |   |   |   |  
| Current liabilities: |   |   |   |   |   |   |   |   |   |  
| Accounts payable and accrued liabilities | $ | 69,863 | 
 |   | $ | 369,129 | 
 |   | $ | 27 | 
 |   | $ | — | 
 |   | $ | 439,019 | 
 |  
| Accounts payable - intercompany | 660,364 | 
 |   | 914,401 | 
 |   | 3,987 | 
 |   | (1,578,752 | ) |   | — | 
 |  
| Short-term derivative instruments | 429 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 429 | 
 |  
| Current portion of operating lease liabilities | 12,848 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 12,848 | 
 |  
| Current portion of operating lease liabilities - related parties | 21,017 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 21,017 | 
 |  
| Current maturities of long-term debt | 622 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 622 | 
 |  
| Total current liabilities | 765,143 | 
 |   | 1,283,530 | 
 |   | 4,014 | 
 |   | (1,578,752 | ) |   | 473,935 | 
 |  
| Long-term derivative instruments | 72,040 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 72,040 | 
 |  
| Asset retirement obligation - long-term | — | 
 |   | 59,819 | 
 |   | — | 
 |   | — | 
 |   | 59,819 | 
 |  
| Uncertain tax position liability | 3,127 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 3,127 | 
 |  
| Non-current operating lease liabilities | 1,072 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 1,072 | 
 |  
| Non-current operating lease liabilities - related parties | 27,432 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 27,432 | 
 |  
| Long-term debt, net of current maturities | 2,076,569 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 2,076,569 | 
 |  
| Total liabilities | 2,945,383 | 
 |   | 1,343,349 | 
 |   | 4,014 | 
 |   | (1,578,752 | ) |   | 2,713,994 | 
 |  
| Stockholders’ equity: |   |   |   |   |   |   |   |   |   |  
| Common stock | 1,597 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 1,597 | 
 |  
| Paid-in capital | 4,205,158 | 
 |   | 4,170,573 | 
 |   | 262,061 | 
 |   | (4,432,634 | ) |   | 4,205,158 | 
 |  
| Accumulated other comprehensive loss | (50,679 | ) |   | — | 
 |   | (48,548 | ) |   | 48,548 | 
 |   | (50,679 | ) |  
| (Accumulated deficit) retained earnings | (1,032,972 | ) |   | 310,075 | 
 |   | (164,533 | ) |   | (145,542 | ) |   | (1,032,972 | ) |  
| Total stockholders’ equity | 3,123,104 | 
 |   | 4,480,648 | 
 |   | 48,980 | 
 |   | (4,529,628 | ) |   | 3,123,104 | 
 |  
| 
Total liabilities and stockholders’ equity
 | $ | 6,068,487 | 
 |   | $ | 5,823,997 | 
 |   | $ | 52,994 | 
 |   | $ | (6,108,380 | ) |   | $ | 5,837,098 | 
 | 
 CONDENSED CONSOLIDATING BALANCE SHEETS 
(Amounts in thousands)
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | December 31, 2018 |  
|   | Parent |   | Guarantors |   | Non-Guarantor |   | Eliminations |   | Consolidated |  
| Assets |   |   |   |   |   |   |   |   |   |  
| Current assets: |   |   |   |   |   |   |   |   |   |  
| Cash and cash equivalents | $ | 25,585 | 
 |   | $ | 26,711 | 
 |   | $ | 1 | 
 |   | $ | — | 
 |   | $ | 52,297 | 
 |  
| Accounts receivable - oil and natural gas sales  | 146,075 | 
 |   | 64,125 | 
 |   | — | 
 |   | — | 
 |   | 210,200 | 
 |  
| Accounts receivable - joint interest and other | 16,212 | 
 |   | 6,285 | 
 |   | — | 
 |   | — | 
 |   | 22,497 | 
 |  
| Accounts receivable - intercompany | 671,633 | 
 |   | 319,464 | 
 |   | — | 
 |   | (991,097 | ) |   | — | 
 |  
| Prepaid expenses and other current assets | 7,843 | 
 |   | 2,174 | 
 |   | — | 
 |   | — | 
 |   | 10,017 | 
 |  
| Short-term derivative instruments | 21,352 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 21,352 | 
 |  
| Total current assets | 888,700 | 
 |   | 418,759 | 
 |   | 1 | 
 |   | (991,097 | ) |   | 316,363 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Property and equipment: |   |   |   |   |   |   |   |   |   |  
| Oil and natural gas properties, full-cost accounting, | 7,044,550 | 
 |   | 2,983,015 | 
 |   | — | 
 |   | (729 | ) |   | 10,026,836 | 
 |  
| Other property and equipment | 91,916 | 
 |   | 751 | 
 |   | — | 
 |   | — | 
 |   | 92,667 | 
 |  
| Accumulated depletion, depreciation, amortization and impairment | (4,640,059 | ) |   | (39 | ) |   | — | 
 |   | — | 
 |   | (4,640,098 | ) |  
| Property and equipment, net | 2,496,407 | 
 |   | 2,983,727 | 
 |   | — | 
 |   | (729 | ) |   | 5,479,405 | 
 |  
| Other assets: |   |   |   |   |   |   |   |   |   |  
| Equity investments and investments in subsidiaries | 2,856,988 | 
 |   | — | 
 |   | 44,259 | 
 |   | (2,665,126 | ) |   | 236,121 | 
 |  
| Inventories | 4,210 | 
 |   | 1,134 | 
 |   | — | 
 |   | — | 
 |   | 5,344 | 
 |  
| Other assets | 12,624 | 
 |   | 1,178 | 
 |   | — | 
 |   | 1 | 
 |   | 13,803 | 
 |  
| Total other assets | 2,873,822 | 
 |   | 2,312 | 
 |   | 44,259 | 
 |   | (2,665,125 | ) |   | 255,268 | 
 |  
|   Total assets | $ | 6,258,929 | 
 |   | $ | 3,404,798 | 
 |   | $ | 44,260 | 
 |   | $ | (3,656,951 | ) |   | $ | 6,051,036 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| 
Liabilities and Stockholders’ Equity
 |   |   |   |   |   |   |   |   |   |  
| Current liabilities: |   |   |   |   |   |   |   |   |   |  
| Accounts payable and accrued liabilities | $ | 419,107 | 
 |   | $ | 99,273 | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | 518,380 | 
 |  
| Accounts payable - intercompany | 320,259 | 
 |   | 670,708 | 
 |   | 130 | 
 |   | (991,097 | ) |   | — | 
 |  
| Short-term derivative instruments | 20,401 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 20,401 | 
 |  
| Current maturities of long-term debt | 651 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 651 | 
 |  
| Total current liabilities | 760,418 | 
 |   | 769,981 | 
 |   | 130 | 
 |   | (991,097 | ) |   | 539,432 | 
 |  
| Long-term derivative instruments | 13,992 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 13,992 | 
 |  
| Asset retirement obligation - long-term | 66,859 | 
 |   | 13,093 | 
 |   | — | 
 |   | — | 
 |   | 79,952 | 
 |  
| Uncertain tax position liability | 3,127 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 3,127 | 
 |  
| Long-term debt, net of current maturities | 2,086,765 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 2,086,765 | 
 |  
| Total liabilities | 2,931,161 | 
 | 
 | 783,074 | 
 | 
 | 130 | 
 | 
 | (991,097 | ) | 
 | 2,723,268 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Stockholders’ equity: |   |   |   |   |   |   |   |   |   |  
| Common stock | 1,630 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | 1,630 | 
 |  
| Paid-in capital | 4,227,532 | 
 |   | 1,915,598 | 
 |   | 261,626 | 
 |   | (2,177,224 | ) |   | 4,227,532 | 
 |  
| Accumulated other comprehensive loss | (56,026 | ) |   | — | 
 |   | (53,783 | ) |   | 53,783 | 
 |   | (56,026 | ) |  
| (Accumulated deficit) retained earnings | (845,368 | ) |   | 706,126 | 
 |   | (163,713 | ) |   | (542,413 | ) |   | (845,368 | ) |  
| Total stockholders’ equity | 3,327,768 | 
 |   | 2,621,724 | 
 |   | 44,130 | 
 |   | (2,665,854 | ) |   | 3,327,768 | 
 |  
| 
  Total liabilities and stockholders’ equity
 | $ | 6,258,929 | 
 |   | $ | 3,404,798 | 
 |   | $ | 44,260 | 
 |   | $ | (3,656,951 | ) |   | $ | 6,051,036 | 
 | 
 | 
| CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS | CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Amounts in thousands) 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Three months ended September 30, 2019 |  
|   | Parent |   | Guarantors |   | Non-Guarantors |   | Eliminations |   | Consolidated |  
|   | As Restated |  
| Total revenues | $ | 27,358 | 
 |   | $ | 257,817 | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | 285,175 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Costs and expenses: |   |   |   |   |   |   |   |   |   |  
| Lease operating expenses | (231 | ) |   | 22,704 | 
 |   | — | 
 |   | — | 
 |   | 22,473 | 
 |  
| Production taxes | 36 | 
 |   | 6,529 | 
 |   | — | 
 |   | — | 
 |   | 6,565 | 
 |  
| Midstream gathering and processing expenses | — | 
 |   | 78,435 | 
 |   | — | 
 |   | — | 
 |   | 78,435 | 
 |  
| Depreciation, depletion and amortization | 2,686 | 
 |   | 160,418 | 
 |   | 166 | 
 |   | — | 
 |   | 163,270 | 
 |  
| Impairment of oil and natural gas properties | — | 
 |   | 571,442 | 
 |   | — | 
 |   | — | 
 |   | 571,442 | 
 |  
| General and administrative expenses | 27,218 | 
 |   | (12,675 | ) |   | 116 | 
 |   | — | 
 |   | 14,659 | 
 |  
| Accretion expense | — | 
 |   | 747 | 
 |   | — | 
 |   | — | 
 |   | 747 | 
 |  
|   | 29,709 | 
 | 
 | 827,600 | 
 | 
 | 282 | 
 | 
 | — | 
 | 
 | 857,591 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| LOSS FROM OPERATIONS | (2,351 | ) | 
 | (569,783 | ) | 
 | (282 | ) | 
 | — | 
 | 
 | (572,416 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| OTHER EXPENSE (INCOME): |   |   |   |   |   |   |   |   |   |  
| Interest expense | 35,105 | 
 |   | (1,010 | ) |   | — | 
 |   | — | 
 |   | 34,095 | 
 |  
| Interest income | (187 | ) |   | (151 | ) |   | — | 
 |   | — | 
 |   | (338 | ) |  
| Gain on debt extinguishment | (23,600 | ) |   | — | 
 |   | — | 
 |   | — | 
 |   | (23,600 | ) |  
| Loss from equity method investments and investments in subsidiaries | 616,348 | 
 |   | — | 
 |   | 40 | 
 |   | (573,306 | ) |   | 43,082 | 
 |  
| Other (income) expense | (1,168 | ) |   | 3,362 | 
 |   | — | 
 |   | 1,000 | 
 |   | 3,194 | 
 |  
|   | 626,498 | 
 | 
 | 2,201 | 
 | 
 | 40 | 
 | 
 | (572,306 | ) | 
 | 56,433 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| LOSS BEFORE INCOME TAXES | (628,849 | ) |   | (571,984 | ) |   | (322 | ) |   | 572,306 | 
 |   | (628,849 | ) |  
| INCOME TAX BENEFIT | (144,047 | ) |   | — | 
 |   | — | 
 |   | — | 
 |   | (144,047 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| NET LOSS | $ | (484,802 | ) | 
 | $ | (571,984 | ) | 
 | $ | (322 | ) | 
 | $ | 572,306 | 
 | 
 | $ | (484,802 | ) | 
 CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Amounts in thousands) 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Three months ended September 30, 2018 |  
|   | Parent |   | Guarantors |   | Non-Guarantor |   | Eliminations |   | Consolidated |  
|   |   |   |   |   |   |   |   |   |   |  
| Total revenues | $ | 235,683 | 
 |   | $ | 125,279 | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | 360,962 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Costs and expenses: |   |   |   |   |   |   |   |   |   |  
| Lease operating expenses | 16,502 | 
 |   | 5,823 | 
 |   | — | 
 |   | — | 
 |   | 22,325 | 
 |  
| Production taxes | 4,505 | 
 |   | 4,843 | 
 |   | — | 
 |   | — | 
 |   | 9,348 | 
 |  
| Midstream gathering and processing expenses | 54,397 | 
 |   | 24,516 | 
 |   | — | 
 |   | — | 
 |   | 78,913 | 
 |  
| Depreciation, depletion and amortization | 119,914 | 
 |   | 1 | 
 |   | — | 
 |   | — | 
 |   | 119,915 | 
 |  
| General and administrative expenses | 16,314 | 
 |   | (467 | ) |   | 1 | 
 |   | — | 
 |   | 15,848 | 
 |  
| Accretion expense | 812 | 
 |   | 225 | 
 |   | — | 
 |   | — | 
 |   | 1,037 | 
 |  
|   | 212,444 | 
 | 
 | 34,941 | 
 | 
 | 1 | 
 | 
 | — | 
 | 
 | 247,386 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| INCOME (LOSS) FROM OPERATIONS | 23,239 | 
 | 
 | 90,338 | 
 | 
 | (1 | ) | 
 | — | 
 | 
 | 113,576 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| OTHER (INCOME) EXPENSE: |   |   |   |   |   |   |   |   |   |  
| Interest expense | 34,254 | 
 |   | (1,001 | ) |   | — | 
 |   | — | 
 |   | 33,253 | 
 |  
| Interest income | (86 | ) |   | (6 | ) |   | — | 
 |   | — | 
 |   | (92 | ) |  
| Gain on sale of equity method investments | (2,733 | ) |   | — | 
 |   | — | 
 |   | — | 
 |   | (2,733 | ) |  
| (Income) loss from equity method investments and investments in subsidiaries | (104,226 | ) |   | (1 | ) |   | 275 | 
 |   | 91,094 | 
 |   | (12,858 | ) |  
| Other expense (income) | 880 | 
 |   | (24 | ) |   | — | 
 |   | — | 
 |   | 856 | 
 |  
|   | (71,911 | ) |   | (1,032 | ) |   | 275 | 
 |   | 91,094 | 
 |   | 18,426 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| INCOME (LOSS) BEFORE INCOME TAXES | 95,150 | 
 | 
 | 91,370 | 
 | 
 | (276 | ) | 
 | (91,094 | ) | 
 | 95,150 | 
 |  
| INCOME TAX BENEFIT | — | 
 |   | — | 
 |   | — | 
 |   | — | 
 |   | — | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| NET INCOME (LOSS) | $ | 95,150 | 
 |   | $ | 91,370 | 
 |   | $ | (276 | ) |   | $ | (91,094 | ) |   | $ | 95,150 | 
 | 
 CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Amounts in thousands) 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Nine months ended September 30, 2019 |  
|   | Parent |   | Guarantors |   | Non-Guarantors |   | Eliminations |   | Consolidated |  
|   | As Restated |  
| Total revenues | $ | 493,895 | 
 |   | $ | 570,852 | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | 1,064,747 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Costs and expenses: |   |   |   |   |   |   |   |   |   |  
| Lease operating expenses | 26,918 | 
 |   | 37,750 | 
 |   | — | 
 |   | — | 
 |   | 64,668 | 
 |  
| Production taxes | 6,117 | 
 |   | 16,467 | 
 |   | — | 
 |   | — | 
 |   | 22,584 | 
 |  
| Midstream gathering and processing expenses | 71,420 | 
 |   | 149,312 | 
 |   | — | 
 |   | — | 
 |   | 220,732 | 
 |  
| Depreciation, depletion, and amortization | 201,250 | 
 |   | 205,183 | 
 |   | 221 | 
 |   | — | 
 |   | 406,654 | 
 |  
| Impairment of oil and gas properties | — | 
 |   | 571,442 | 
 |   | — | 
 |   | — | 
 |   | 571,442 | 
 |  
| General and administrative expenses | 56,195 | 
 |   | (16,933 | ) |   | 220 | 
 |   | — | 
 |   | 39,482 | 
 |  
| Accretion expense | 1,389 | 
 |   | 1,784 | 
 |   | — | 
 |   | — | 
 |   | 3,173 | 
 |  
|   | 363,289 | 
 |   | 965,005 | 
 |   | 441 | 
 |   | — | 
 |   | 1,328,735 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| INCOME (LOSS) FROM OPERATIONS | 130,606 | 
 |   | (394,153 | ) |   | (441 | ) |   | — | 
 |   | (263,988 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| OTHER EXPENSE (INCOME): |   |   |   |   |   |   |   |   |   |  
| Interest expense | 105,364 | 
 |   | (2,269 | ) |   | — | 
 |   | — | 
 |   | 103,095 | 
 |  
| Interest income | (454 | ) |   | (195 | ) |   | — | 
 |   | — | 
 |   | (649 | ) |  
| Gain on debt extinguishment | (23,600 | ) |   | — | 
 |   | — | 
 |   | — | 
 |   | (23,600 | ) |  
| Loss from equity method investments and investments in subsidiaries | 560,883 | 
 |   | — | 
 |   | 379 | 
 |   | (396,871 | ) |   | 164,391 | 
 |  
| Other (income) expense | (605 | ) |   | 3,362 | 
 |   | — | 
 |   | 1,000 | 
 |   | 3,757 | 
 |  
|   | 641,588 | 
 |   | 898 | 
 |   | 379 | 
 |   | (395,871 | ) |   | 246,994 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| LOSS BEFORE INCOME TAXES | (510,982 | ) |   | (395,051 | ) |   | (820 | ) |   | 395,871 | 
 |   | (510,982 | ) |  
| INCOME TAX BENEFIT | (323,378 | ) |   | — | 
 |   | — | 
 |   | — | 
 |   | (323,378 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| NET LOSS | $ | (187,604 | ) |   | $ | (395,051 | ) |   | $ | (820 | ) |   | $ | 395,871 | 
 |   | $ | (187,604 | ) | 
 CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Amounts in thousands) 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Nine months ended September 30, 2018 |  
|   | Parent |   | Guarantors |   | Non-Guarantor |   | Eliminations |   | Consolidated |  
|   |   |   |   |   |   |   |   |   |   |  
| Total revenues | $ | 596,018 | 
 |   | $ | 343,076 | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | 939,094 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Costs and expenses: |   |   |   |   |   |   |   |   |   |  
| Lease operating expenses | 46,926 | 
 |   | 17,217 | 
 |   | — | 
 |   | — | 
 |   | 64,143 | 
 |  
| Production taxes | 13,309 | 
 |   | 10,552 | 
 |   | — | 
 |   | — | 
 |   | 23,861 | 
 |  
| Midstream gathering and processing expenses | 152,605 | 
 |   | 61,941 | 
 |   | — | 
 |   | — | 
 |   | 214,546 | 
 |  
| Depreciation, depletion, and amortization | 352,846 | 
 |   | 2 | 
 |   | — | 
 |   | — | 
 |   | 352,848 | 
 |  
| General and administrative expenses | 45,100 | 
 |   | (2,148 | ) |   | 3 | 
 |   | — | 
 |   | 42,955 | 
 |  
| Accretion expense | 2,397 | 
 |   | 659 | 
 |   | — | 
 |   | — | 
 |   | 3,056 | 
 |  
|   | 613,183 | 
 |   | 88,223 | 
 |   | 3 | 
 |   | — | 
 |   | 701,409 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| (LOSS) INCOME FROM OPERATIONS | (17,165 | ) |   | 254,853 | 
 |   | (3 | ) |   | — | 
 |   | 237,685 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| OTHER (INCOME) EXPENSE: |   |   |   |   |   |   |   |   |   |  
| Interest expense | 103,310 | 
 |   | (2,388 | ) |   | — | 
 |   | — | 
 |   | 100,922 | 
 |  
| Interest income | (144 | ) |   | (18 | ) |   | — | 
 |   | — | 
 |   | (162 | ) |  
| Gain on sale of equity method investments | (28,349 | ) |   | (96,419 | ) |   | — | 
 |   | — | 
 |   | (124,768 | ) |  
| (Income) loss from equity method investments and investments in subsidiaries | (387,991 | ) |   | (694 | ) |   | 833 | 
 |   | 352,570 | 
 |   | (35,282 | ) |  
| Other (income) expense | (481 | ) |   | (34 | ) |   | — | 
 |   | 1,000 | 
 |   | 485 | 
 |  
|   | (313,655 | ) |   | (99,553 | ) |   | 833 | 
 |   | 353,570 | 
 |   | (58,805 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| INCOME (LOSS) BEFORE INCOME TAXES | 296,490 | 
 |   | 354,406 | 
 |   | (836 | ) |   | (353,570 | ) |   | 296,490 | 
 |  
| INCOME TAX BENEFIT | (69 | ) |   | — | 
 |   | — | 
 |   | — | 
 |   | (69 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| NET INCOME (LOSS)  | $ | 296,559 | 
 |   | $ | 354,406 | 
 |   | $ | (836 | ) |   | $ | (353,570 | ) |   | $ | 296,559 | 
 | 
 | 
| CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) | CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)  (Amounts in thousands) 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Three months ended September 30, 2019 |  
|   | Parent |   | Guarantors |   | Non-Guarantors |   | Eliminations |   | Consolidated |  
|   | As Restated |  
| Net loss | $ | (484,802 | ) |   | $ | (571,984 | ) |   | $ | (322 | ) |   | $ | 572,306 | 
 |   | $ | (484,802 | ) |  
| Foreign currency translation adjustment | (2,064 | ) |   | (43 | ) |   | (2,021 | ) |   | 2,064 | 
 |   | (2,064 | ) |  
| Other comprehensive loss | (2,064 | ) |   | (43 | ) |   | (2,021 | ) |   | 2,064 | 
 |   | (2,064 | ) |  
| Comprehensive loss | $ | (486,866 | ) |   | $ | (572,027 | ) |   | $ | (2,343 | ) |   | $ | 574,370 | 
 |   | $ | (486,866 | ) | 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Three months ended September 30, 2018 |  
|   | Parent |   | Guarantors |   | Non-Guarantor |   | Eliminations |   | Consolidated |  
|   |   |   |   |   |   |   |   |   |   |  
| Net income (loss) | $ | 95,150 | 
 |   | $ | 91,370 | 
 |   | $ | (276 | ) |   | $ | (91,094 | ) |   | $ | 95,150 | 
 |  
| Foreign currency translation adjustment | 3,052 | 
 |   | 103 | 
 |   | 2,949 | 
 |   | (3,052 | ) |   | 3,052 | 
 |  
| Other comprehensive income | 3,052 | 
 |   | 103 | 
 |   | 2,949 | 
 |   | (3,052 | ) |   | 3,052 | 
 |  
| Comprehensive income | $ | 98,202 | 
 |   | $ | 91,473 | 
 |   | $ | 2,673 | 
 |   | $ | (94,146 | ) |   | $ | 98,202 | 
 | 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Nine months ended September 30, 2019 |  
|   | Parent |   | Guarantors |   | Non-Guarantors |   | Eliminations |   | Consolidated |  
|   | As Restated |  
| Net loss | $ | (187,604 | ) |   | $ | (395,051 | ) |   | $ | (820 | ) |   | $ | 395,871 | 
 |   | $ | (187,604 | ) |  
| Foreign currency translation adjustment | 5,347 | 
 |   | 112 | 
 |   | 5,235 | 
 |   | (5,347 | ) |   | 5,347 | 
 |  
| Other comprehensive income | 5,347 | 
 |   | 112 | 
 |   | 5,235 | 
 |   | (5,347 | ) |   | 5,347 | 
 |  
| Comprehensive (loss) income  | $ | (182,257 | ) |   | $ | (394,939 | ) |   | $ | 4,415 | 
 |   | $ | 390,524 | 
 |   | $ | (182,257 | ) | 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Nine months ended September 30, 2018 |  
|   | Parent |   | Guarantors |   | Non-Guarantor |   | Eliminations |   | Consolidated |  
|   |   |  
| Net income (loss) | $ | 296,559 | 
 |   | $ | 354,406 | 
 |   | $ | (836 | ) |   | $ | (353,570 | ) |   | $ | 296,559 | 
 |  
| Foreign currency translation adjustment | (5,815 | ) |   | (70 | ) |   | (5,745 | ) |   | 5,815 | 
 |   | (5,815 | ) |  
| Other comprehensive loss | (5,815 | ) |   | (70 | ) |   | (5,745 | ) |   | 5,815 | 
 |   | (5,815 | ) |  
| Comprehensive income (loss)  | $ | 290,744 | 
 |   | $ | 354,336 | 
 |   | $ | (6,581 | ) |   | $ | (347,755 | ) |   | $ | 290,744 | 
 | 
 | 
| CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS | CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (Amounts in thousands) 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Nine months ended September 30, 2019 |  
|   | Parent |   | Guarantors |   | Non-Guarantors |   | Eliminations |   | Consolidated |  
|   | As Restated |  
| Net cash (used in) provided by operating activities | $ | (7,604 | ) |   | $ | 621,511 | 
 |   | $ | 3,445 | 
 |   | $ | 3 | 
 |   | $ | 617,355 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Net cash provided by (used in) investing activities | 9,178 | 
 |   | (644,507 | ) |   | (3,751 | ) |   | 432 | 
 |   | (638,648 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| Net cash (used in) provided by financing activities | (20,880 | ) |   | — | 
 |   | 435 | 
 |   | (435 | ) |   | (20,880 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| Net (decrease) increase in cash, cash equivalents and restricted cash | (19,306 | ) |   | (22,996 | ) |   | 129 | 
 |   | — | 
 |   | (42,173 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| Cash, cash equivalents and restricted cash at beginning of period | 25,585 | 
 |   | 26,711 | 
 |   | 1 | 
 |   | — | 
 |   | 52,297 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Cash, cash equivalents and restricted cash at end of period | $ | 6,279 | 
 |   | $ | 3,715 | 
 |   | $ | 130 | 
 |   | $ | — | 
 |   | $ | 10,124 | 
 | 
 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   | Nine months ended September 30, 2018 |  
|   | Parent |   | Guarantors |   | Non-Guarantor |   | Eliminations |   | Consolidated |  
|   |   |   |   |   |   |   |   |   |   |  
| Net cash provided by (used in) operating activities | $ | 427,351 | 
 |   | $ | 203,446 | 
 |   | $ | (1 | ) |   | $ | 1 | 
 |   | $ | 630,797 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Net cash (used in) provided by investing activities | (354,848 | ) |   | (199,738 | ) |   | (2,318 | ) |   | 2,318 | 
 |   | (554,586 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| Net cash (used in) provided by financing activities | (51,197 | ) |   | — | 
 |   | 2,319 | 
 |   | (2,319 | ) |   | (51,197 | ) |  
|   |   |   |   |   |   |   |   |   |   |  
| Net increase in cash, cash equivalents and restricted cash | 21,306 | 
 |   | 3,708 | 
 |   | — | 
 |   | — | 
 |   | 25,014 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Cash, cash equivalents and restricted cash at beginning of period | 67,908 | 
 |   | 31,649 | 
 |   | — | 
 |   | — | 
 |   | 99,557 | 
 |  
|   |   |   |   |   |   |   |   |   |   |  
| Cash, cash equivalents and restricted cash at end of period | $ | 89,214 | 
 |   | $ | 35,357 | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | 124,571 | 
 | 
 |