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Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 52,297,000 | $ 99,557,000 |  |
Accounts receivable—oil and natural gas sales | 210,200,000 | 146,773,000 |  |
Accounts receivable - joint interest and other | 22,497,000 | 35,440,000 |  |
Accounts receivable - intercompany | 0 | 0 |  |
Prepaid expenses and other current assets | 10,607,000 | 4,912,000 |  |
Short-term derivative instruments - asset | 21,352,000 | 78,847,000 |  |
Total current assets | 316,953,000 | 365,529,000 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 10,026,836,000 | 9,169,156,000 |  |
Other property and equipment | 92,667,000 | 86,754,000 |  |
Accumulated depletion, depreciation, amortization and impairment | (4,640,098,000) | (4,153,733,000) |  |
Property and equipment, net | 5,479,405,000 | 5,102,177,000 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 236,121,000 | 302,112,000 |  |
Long-term derivative instruments | 0 | 8,685,000 |  |
Deferred tax asset | 0 | 1,208,000 |  |
Inventories | 4,754,000 | 8,227,000 |  |
Other assets | 13,803,000 | 19,814,000 |  |
Total other assets | 254,678,000 | 340,046,000 |  |
Total assets | 6,051,036,000 | 5,807,752,000 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 518,380,000 | 553,609,000 |  |
Accounts payable - intercompany | 0 | 0 |  |
Asset retirement obligation—current | 0 | 120,000 |  |
Short-term derivative instruments | 20,401,000 | 32,534,000 |  |
Current maturities of long-term debt | 651,000 | 622,000 |  |
Total current liabilities | 539,432,000 | 586,885,000 |  |
Long-term derivative instruments | 13,992,000 | 2,989,000 |  |
Asset retirement obligation—long-term | 79,952,000 | 74,980,000 |  |
Deferred tax liability | 3,127,000 | 0 |  |
Other non-current liabilities | 0 | 2,963,000 |  |
Long-term debt, net of current maturities | 2,086,765,000 | 2,038,321,000 |  |
Total liabilities | 2,723,268,000 | 2,706,138,000 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,630,000 | 1,831,000 |  |
Paid-in capital | 4,227,532,000 | 4,416,250,000 |  |
Accumulated other comprehensive loss | (56,026,000) | (40,539,000) |  |
(Accumulated deficit) retained earnings | (845,368,000) | (1,275,928,000) |  |
Total stockholders’ equity | 3,327,768,000 | 3,101,614,000 | $ 2,183,892,000 | $ 2,038,837,000
Total liabilities and stockholders’ equity | 6,051,036,000 | 5,807,752,000 |  |
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 | (991,097,000) | (617,813,000) |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Short-term derivative instruments - asset | 0 | 0 |  |
Total current assets | (991,097,000) | (617,813,000) |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | (729,000) | (729,000) |  |
Other property and equipment | 0 | 0 |  |
Accumulated depletion, depreciation, amortization and impairment | 0 | 0 |  |
Property and equipment, net | (729,000) | (729,000) |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | (2,665,126,000) | (2,194,848,000) |  |
Long-term derivative instruments |  | 0 |  |
Deferred tax asset |  | 0 |  |
Inventories | 0 | 0 |  |
Other assets | 1,000 | 0 |  |
Total other assets | (2,665,125,000) | (2,194,848,000) |  |
Total assets | (3,656,951,000) | (2,813,390,000) |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities |  | (1,000) |  |
Accounts payable - intercompany | (991,097,000) | (617,813,000) |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments | 0 | 0 |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | (991,097,000) | (617,814,000) |  |
Long-term derivative instruments | 0 | 0 |  |
Asset retirement obligation—long-term | 0 | 0 |  |
Deferred tax liability | 0 |  |  |
Other non-current liabilities |  | 0 |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | (991,097,000) | (617,814,000) |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | (2,177,224,000) | (2,174,905,000) |  |
Accumulated other comprehensive loss | 53,783,000 | 38,593,000 |  |
(Accumulated deficit) retained earnings | (542,413,000) | (59,264,000) |  |
Total stockholders’ equity | (2,665,854,000) | (2,195,576,000) |  |
Total liabilities and stockholders’ equity | (3,656,951,000) | (2,813,390,000) |  |
Parent |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 25,585,000 | 67,908,000 |  |
Accounts receivable—oil and natural gas sales | 146,075,000 | 112,686,000 |  |
Accounts receivable - joint interest and other | 16,212,000 | 15,435,000 |  |
Accounts receivable - intercompany | 671,633,000 | 554,439,000 |  |
Prepaid expenses and other current assets | 8,433,000 | 4,719,000 |  |
Short-term derivative instruments - asset | 21,352,000 | 78,847,000 |  |
Total current assets | 889,290,000 | 834,034,000 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 7,044,550,000 | 6,562,147,000 |  |
Other property and equipment | 91,916,000 | 86,711,000 |  |
Accumulated depletion, depreciation, amortization and impairment | (4,640,059,000) | (4,153,696,000) |  |
Property and equipment, net | 2,496,407,000 | 2,495,162,000 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 2,856,988,000 | 2,361,575,000 |  |
Long-term derivative instruments |  | 8,685,000 |  |
Deferred tax asset |  | 1,208,000 |  |
Inventories | 3,620,000 | 5,816,000 |  |
Other assets | 12,624,000 | 12,483,000 |  |
Total other assets | 2,873,232,000 | 2,389,767,000 |  |
Total assets | 6,258,929,000 | 5,718,963,000 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 419,107,000 | 416,249,000 |  |
Accounts payable - intercompany | 320,259,000 | 63,373,000 |  |
Asset retirement obligation—current |  | 120,000 |  |
Short-term derivative instruments | 20,401,000 | 32,534,000 |  |
Current maturities of long-term debt | 651,000 | 622,000 |  |
Total current liabilities | 760,418,000 | 512,898,000 |  |
Long-term derivative instruments | 13,992,000 | 2,989,000 |  |
Asset retirement obligation—long-term | 66,859,000 | 63,141,000 |  |
Deferred tax liability | 3,127,000 |  |  |
Other non-current liabilities |  | 0 |  |
Long-term debt, net of current maturities | 2,086,765,000 | 2,038,321,000 |  |
Total liabilities | 2,931,161,000 | 2,617,349,000 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,630,000 | 1,831,000 |  |
Paid-in capital | 4,227,532,000 | 4,416,250,000 |  |
Accumulated other comprehensive loss | (56,026,000) | (40,539,000) |  |
(Accumulated deficit) retained earnings | (845,368,000) | (1,275,928,000) |  |
Total stockholders’ equity | 3,327,768,000 | 3,101,614,000 |  |
Total liabilities and stockholders’ equity | 6,258,929,000 | 5,718,963,000 |  |
Guarantors |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 26,711,000 | 31,649,000 |  |
Accounts receivable—oil and natural gas sales | 64,125,000 | 34,087,000 |  |
Accounts receivable - joint interest and other | 6,285,000 | 20,005,000 |  |
Accounts receivable - intercompany | 319,464,000 | 63,374,000 |  |
Prepaid expenses and other current assets | 2,174,000 | 193,000 |  |
Short-term derivative instruments - asset | 0 | 0 |  |
Total current assets | 418,759,000 | 149,308,000 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 2,983,015,000 | 2,607,738,000 |  |
Other property and equipment | 751,000 | 43,000 |  |
Accumulated depletion, depreciation, amortization and impairment | (39,000) | (37,000) |  |
Property and equipment, net | 2,983,727,000 | 2,607,744,000 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 0 | 77,744,000 |  |
Long-term derivative instruments |  | 0 |  |
Deferred tax asset |  | 0 |  |
Inventories | 1,134,000 | 2,411,000 |  |
Other assets | 1,178,000 | 7,331,000 |  |
Total other assets | 2,312,000 | 87,486,000 |  |
Total assets | 3,404,798,000 | 2,844,538,000 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 99,273,000 | 137,361,000 |  |
Accounts payable - intercompany | 670,708,000 | 554,313,000 |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments | 0 | 0 |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | 769,981,000 | 691,674,000 |  |
Long-term derivative instruments | 0 | 0 |  |
Asset retirement obligation—long-term | 13,093,000 | 11,839,000 |  |
Deferred tax liability | 0 |  |  |
Other non-current liabilities |  | 2,963,000 |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | 783,074,000 | 706,476,000 |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | 1,915,598,000 | 1,915,598,000 |  |
Accumulated other comprehensive loss | 0 | 0 |  |
(Accumulated deficit) retained earnings | 706,126,000 | 222,464,000 |  |
Total stockholders’ equity | 2,621,724,000 | 2,138,062,000 |  |
Total liabilities and stockholders’ equity | 3,404,798,000 | 2,844,538,000 |  |
Non-Guarantor |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 1,000 | 0 |  |
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 | 0 | 0 |  |
Short-term derivative instruments - asset | 0 | 0 |  |
Total current assets | 1,000 |  |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 0 | 0 |  |
Other property and equipment | 0 | 0 |  |
Accumulated depletion, depreciation, amortization and impairment | 0 | 0 |  |
Property and equipment, net | 0 | 0 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 44,259,000 | 57,641,000 |  |
Long-term derivative instruments |  | 0 |  |
Deferred tax asset |  | 0 |  |
Inventories | 0 | 0 |  |
Other assets | 0 | 0 |  |
Total other assets | 44,259,000 | 57,641,000 |  |
Total assets | 44,260,000 | 57,641,000 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 0 | 0 |  |
Accounts payable - intercompany | 130,000 | 127,000 |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments | 0 | 0 |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | 130,000 | 127,000 |  |
Long-term derivative instruments | 0 | 0 |  |
Asset retirement obligation—long-term | 0 | 0 |  |
Deferred tax liability | 0 |  |  |
Other non-current liabilities |  | 0 |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | 130,000 | 127,000 |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | 261,626,000 | 259,307,000 |  |
Accumulated other comprehensive loss | (53,783,000) | (38,593,000) |  |
(Accumulated deficit) retained earnings | (163,713,000) | (163,200,000) |  |
Total stockholders’ equity | 44,130,000 | 57,514,000 |  |
Total liabilities and stockholders’ equity | $ 44,260,000 | $ 57,641,000 |  |

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