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Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 6,060 | $ 52,297 |  |
Accounts receivable—oil and natural gas sales | 121,210 | 210,200 |  |
Accounts receivable - joint interest and other | 47,975 | 22,497 |  |
Accounts receivable - intercompany | 0 | 0 |  |
Prepaid expenses and other current assets | 4,431 | 10,017 |  |
Total short-term derivative instruments – asset | 126,201 | 21,352 |  |
Total current assets | 305,877 | 316,363 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 10,595,735 | 10,026,836 |  |
Other property and equipment | 96,719 | 92,667 |  |
Accumulated depletion, depreciation, amortization and impairment | (7,228,660) | (4,640,098) |  |
Property and equipment, net | 3,463,794 | 5,479,405 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 32,044 | 236,121 |  |
Long-term derivative instruments | 563 | 0 |  |
Deferred tax asset | 7,563 | 0 |  |
Inventories | 5,182 | 5,344 |  |
Operating lease assets | 14,168 | 0 |  |
Operating lease assets - related parties | 43,270 | 0 |  |
Other assets | 10,358 | 13,803 |  |
Total other assets | 113,148 | 255,268 |  |
Total assets | 3,882,819 | 6,051,036 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 415,218 | 518,380 |  |
Accounts payable - intercompany | 0 | 0 |  |
Short-term derivative instruments | 303 | 20,401 |  |
Current portion of operating lease liabilities | 13,826 | 0 |  |
Current portion of operating lease liabilities - related parties | 21,220 | 0 |  |
Current maturities of long-term debt | 631 | 651 |  |
Total current liabilities | 451,198 | 539,432 |  |
Long-term derivative instruments | 53,135 | 13,992 |  |
Asset retirement obligation—long-term | 60,355 | 79,952 |  |
Uncertain tax position liability | 3,127 | 3,127 |  |
Non-current operating lease liabilities | 342 | 0 |  |
Non-current operating lease liabilities - related parties | 22,050 | 0 |  |
Long-term debt, net of current maturities | 1,978,020 | 2,086,765 |  |
Total liabilities | 2,568,227 | 2,723,268 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,597 | 1,630 |  |
Paid-in capital | 4,207,554 | 4,227,532 |  |
Accumulated other comprehensive loss | (46,833) | (56,026) |  |
Accumulated deficit | (2,847,726) | (845,368) |  |
Total stockholders’ equity | 1,314,592 | 3,327,768 | $ 3,101,614 | $ 2,183,892
Total liabilities and stockholders’ equity | 3,882,819 | 6,051,036 |  |
Eliminations |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Accounts receivable—oil and natural gas sales |  | 0 |  |
Accounts receivable - joint interest and other | 0 | 0 |  |
Accounts receivable - intercompany | (1,908,816) | (991,097) |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Total short-term derivative instruments – asset | 0 | 0 |  |
Total current assets | (1,908,816) | (991,097) |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | (729) | (729) |  |
Other property and equipment | 0 | 0 |  |
Accumulated depletion, depreciation, amortization and impairment | 0 | 0 |  |
Property and equipment, net | (729) | (729) |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | (3,059,791) | (2,665,126) |  |
Long-term derivative instruments | 0 |  |  |
Deferred tax asset | 0 |  |  |
Inventories | 0 | 0 |  |
Operating lease assets | 0 |  |  |
Operating lease assets - related parties | 0 |  |  |
Other assets |  | 1 |  |
Total other assets | (3,059,791) | (2,665,125) |  |
Total assets | (4,969,336) | (3,656,951) |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities |  | 0 |  |
Accounts payable - intercompany | (1,908,817) | (991,097) |  |
Short-term derivative instruments | 0 | 0 |  |
Current portion of operating lease liabilities | 0 |  |  |
Current portion of operating lease liabilities - related parties | 0 |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | (1,908,817) | (991,097) |  |
Long-term derivative instruments | 0 | 0 |  |
Asset retirement obligation—long-term | 0 | 0 |  |
Uncertain tax position liability | 0 | 0 |  |
Non-current operating lease liabilities | 0 |  |  |
Non-current operating lease liabilities - related parties | 0 |  |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | (1,908,817) | (991,097) |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | (4,438,965) | (2,177,224) |  |
Accumulated other comprehensive loss | 44,763 | 53,783 |  |
Accumulated deficit | 1,333,683 | (542,413) |  |
Total stockholders’ equity | (3,060,519) | (2,665,854) |  |
Total liabilities and stockholders’ equity | (4,969,336) | (3,656,951) |  |
Parent |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 2,768 | 25,585 |  |
Accounts receivable—oil and natural gas sales | 859 | 146,075 |  |
Accounts receivable - joint interest and other | 5,279 | 16,212 |  |
Accounts receivable - intercompany | 1,065,593 | 671,633 |  |
Prepaid expenses and other current assets | 4,047 | 7,843 |  |
Total short-term derivative instruments – asset | 126,201 | 21,352 |  |
Total current assets | 1,204,747 | 888,700 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 1,314,933 | 7,044,550 |  |
Other property and equipment | 92,650 | 91,916 |  |
Accumulated depletion, depreciation, amortization and impairment | (1,418,888) | (4,640,059) |  |
Property and equipment, net | (11,305) | 2,496,407 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 3,064,503 | 2,856,988 |  |
Long-term derivative instruments | 563 |  |  |
Deferred tax asset | 7,563 |  |  |
Inventories | 0 | 4,210 |  |
Operating lease assets | 14,168 |  |  |
Operating lease assets - related parties | 43,270 |  |  |
Other assets | 10,026 | 12,624 |  |
Total other assets | 3,140,093 | 2,873,822 |  |
Total assets | 4,333,535 | 6,258,929 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 48,006 | 419,107 |  |
Accounts payable - intercompany | 878,283 | 320,259 |  |
Short-term derivative instruments | 303 | 20,401 |  |
Current portion of operating lease liabilities | 13,826 |  |  |
Current portion of operating lease liabilities - related parties | 21,220 |  |  |
Current maturities of long-term debt | 631 | 651 |  |
Total current liabilities | 962,269 | 760,418 |  |
Long-term derivative instruments | 53,135 | 13,992 |  |
Asset retirement obligation—long-term | 0 | 66,859 |  |
Uncertain tax position liability | 3,127 | 3,127 |  |
Non-current operating lease liabilities | 342 |  |  |
Non-current operating lease liabilities - related parties | 22,050 |  |  |
Long-term debt, net of current maturities | 1,978,020 | 2,086,765 |  |
Total liabilities | 3,018,943 | 2,931,161 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,597 | 1,630 |  |
Paid-in capital | 4,207,554 | 4,227,532 |  |
Accumulated other comprehensive loss | (46,833) | (56,026) |  |
Accumulated deficit | (2,847,726) | (845,368) |  |
Total stockholders’ equity | 1,314,592 | 3,327,768 |  |
Total liabilities and stockholders’ equity | 4,333,535 | 6,258,929 |  |
Guarantors |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 3,097 | 26,711 |  |
Accounts receivable—oil and natural gas sales | 120,351 | 64,125 |  |
Accounts receivable - joint interest and other | 42,696 | 6,285 |  |
Accounts receivable - intercompany | 843,223 | 319,464 |  |
Prepaid expenses and other current assets | 308 | 2,174 |  |
Total short-term derivative instruments – asset | 0 | 0 |  |
Total current assets | 1,009,675 | 418,759 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 9,273,681 | 2,983,015 |  |
Other property and equipment | 50 | 751 |  |
Accumulated depletion, depreciation, amortization and impairment | (5,808,254) | (39) |  |
Property and equipment, net | 3,465,477 | 2,983,727 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 6,332 | 0 |  |
Long-term derivative instruments | 0 |  |  |
Deferred tax asset | 0 |  |  |
Inventories | 5,182 | 1,134 |  |
Operating lease assets | 0 |  |  |
Operating lease assets - related parties | 0 |  |  |
Other assets | 332 | 1,178 |  |
Total other assets | 11,846 | 2,312 |  |
Total assets | 4,486,998 | 3,404,798 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 367,088 | 99,273 |  |
Accounts payable - intercompany | 1,026,249 | 670,708 |  |
Short-term derivative instruments | 0 | 0 |  |
Current portion of operating lease liabilities | 0 |  |  |
Current portion of operating lease liabilities - related parties | 0 |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | 1,393,337 | 769,981 |  |
Long-term derivative instruments | 0 | 0 |  |
Asset retirement obligation—long-term | 58,322 | 13,093 |  |
Uncertain tax position liability | 0 | 0 |  |
Non-current operating lease liabilities | 0 |  |  |
Non-current operating lease liabilities - related parties | 0 |  |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | 1,451,659 | 783,074 |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | 4,171,408 | 1,915,598 |  |
Accumulated other comprehensive loss | 0 | 0 |  |
Accumulated deficit | (1,136,069) | 706,126 |  |
Total stockholders’ equity | 3,035,339 | 2,621,724 |  |
Total liabilities and stockholders’ equity | 4,486,998 | 3,404,798 |  |
Non-Guarantor |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 195 | 1 |  |
Accounts receivable—oil and natural gas sales | 0 | 0 |  |
Accounts receivable - joint interest and other | 0 | 0 |  |
Accounts receivable - intercompany | 0 | 0 |  |
Prepaid expenses and other current assets | 76 | 0 |  |
Total short-term derivative instruments – asset | 0 | 0 |  |
Total current assets | 271 | 1 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 7,850 | 0 |  |
Other property and equipment | 4,019 | 0 |  |
Accumulated depletion, depreciation, amortization and impairment | (1,518) | 0 |  |
Property and equipment, net | 10,351 | 0 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 21,000 | 44,259 |  |
Long-term derivative instruments | 0 |  |  |
Deferred tax asset | 0 |  |  |
Inventories | 0 | 0 |  |
Operating lease assets | 0 |  |  |
Operating lease assets - related parties | 0 |  |  |
Other assets |  | 0 |  |
Total other assets | 21,000 | 44,259 |  |
Total assets | 31,622 | 44,260 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 124 | 0 |  |
Accounts payable - intercompany | 4,285 | 130 |  |
Short-term derivative instruments | 0 | 0 |  |
Current portion of operating lease liabilities | 0 |  |  |
Current portion of operating lease liabilities - related parties | 0 |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | 4,409 | 130 |  |
Long-term derivative instruments | 0 | 0 |  |
Asset retirement obligation—long-term | 2,033 | 0 |  |
Uncertain tax position liability | 0 | 0 |  |
Non-current operating lease liabilities | 0 |  |  |
Non-current operating lease liabilities - related parties | 0 |  |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | 6,442 | 130 |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | 267,557 | 261,626 |  |
Accumulated other comprehensive loss | (44,763) | (53,783) |  |
Accumulated deficit | (197,614) | (163,713) |  |
Total stockholders’ equity | 25,180 | 44,130 |  |
Total liabilities and stockholders’ equity | $ 31,622 | $ 44,260 |  |

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