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Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 102,485 | $ 1,275,875 | $ 454,377 | $ 112,974
Restricted Cash | 0 | 185,000 |  |
Accounts receivable—oil and gas | 158,154 | 136,761 |  |
Accounts receivable - related parties | 39 | 16 |  |
Accounts receivable - intercompany |  | 0 |  |
Prepaid expenses and other current assets | 16,005 | 7,639 |  |
Short-term derivative instruments | 18,925 | 3,488 |  |
Total current assets | 295,608 | 1,608,779 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | 8,146,321 | 6,071,920 |  |
Other property and equipment | 75,107 | 68,986 |  |
Accumulated depletion, depreciation, amortization and impairment | (3,855,629) | (3,789,780) |  |
Property and equipment, net | 4,365,799 | 2,351,126 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 251,370 | 243,920 |  |
Long-term derivative instruments | 23,515 | 5,696 |  |
Deferred tax asset | 4,692 | 4,692 |  |
Other assets | 12,945 | 8,932 |  |
Total other assets | 292,522 | 263,240 |  |
Total assets | 4,953,929 | 4,223,145 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 406,139 | 265,124 |  |
Accounts payable - intercompany | 0 | 0 |  |
Asset retirement obligation—current | 195 | 195 | 75 |
Derivative instruments | 67,179 | 119,219 |  |
Current maturities of long-term debt | 452 | 276 |  |
Total current liabilities | 473,965 | 384,814 |  |
Long-term derivative instrument | 5,259 | 26,759 |  |
Asset retirement obligation—long-term | 41,142 | 34,081 | 28,471 |
Long-term debt, net of current maturities | 1,631,809 | 1,593,599 |  |
Total liabilities | 2,152,175 | 2,039,253 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,828 | 1,588 |  |
Paid-in capital | 4,408,236 | 3,946,442 |  |
Accumulated other comprehensive (loss) income | (51,685) | (53,058) |  |
Retained (deficit) earnings | (1,556,625) | (1,711,080) |  |
Total stockholders’ equity | 2,801,754 | 2,183,892 | 2,220,789 | 2,038,837
Total liabilities and stockholders’ equity | 4,953,929 | 4,223,145 |  |
Reportable Legal Entities | Parent |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 71,934 | 1,273,882 | 453,743 | 112,494
Restricted Cash |  | 185,000 |  |
Accounts receivable—oil and gas | 106,008 | 137,087 |  |
Accounts receivable - related parties | 39 | 16 |  |
Accounts receivable - intercompany | 447,275 | 449,517 |  |
Prepaid expenses and other current assets | 12,330 | 6,230 |  |
Short-term derivative instruments | 18,925 | 3,488 |  |
Total current assets | 656,511 | 2,055,220 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | 5,869,066 | 5,655,125 |  |
Other property and equipment | 75,064 | 68,943 |  |
Accumulated depletion, depreciation, amortization and impairment | (3,855,594) | (3,789,746) |  |
Property and equipment, net | 2,088,536 | 1,934,322 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 2,120,462 | 236,327 |  |
Long-term derivative instruments | 23,515 | 5,696 |  |
Deferred tax asset | 4,692 | 4,692 |  |
Other assets | 8,765 | 8,932 |  |
Total other assets | 2,157,434 | 255,647 |  |
Total assets | 4,902,481 | 4,245,189 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 326,175 | 255,966 |  |
Accounts payable - intercompany | 35,005 | 31,202 |  |
Asset retirement obligation—current | 195 | 195 |  |
Derivative instruments | 67,179 | 119,219 |  |
Current maturities of long-term debt | 452 | 276 |  |
Total current liabilities | 429,006 | 406,858 |  |
Long-term derivative instrument | 5,259 | 26,759 |  |
Asset retirement obligation—long-term | 34,653 | 34,081 |  |
Long-term debt, net of current maturities | 1,631,809 | 1,593,599 |  |
Total liabilities | 2,100,727 | 2,061,297 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,828 | 1,588 |  |
Paid-in capital | 4,408,236 | 3,946,442 |  |
Accumulated other comprehensive (loss) income | (51,685) | (53,058) |  |
Retained (deficit) earnings | (1,556,625) | (1,711,080) |  |
Total stockholders’ equity | 2,801,754 | 2,183,892 |  |
Total liabilities and stockholders’ equity | 4,902,481 | 4,245,189 |  |
Reportable Legal Entities | Guarantors |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 30,550 | 1,993 | 634 | 479
Restricted Cash |  | 0 |  |
Accounts receivable—oil and gas | 52,146 | 37,496 |  |
Accounts receivable - related parties | 0 | 0 |  |
Accounts receivable - intercompany | 35,434 | 1,151 |  |
Prepaid expenses and other current assets | 3,675 | 1,409 |  |
Short-term derivative instruments | 0 | 0 |  |
Total current assets | 121,805 | 42,049 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | 2,277,984 | 417,524 |  |
Other property and equipment | 43 | 43 |  |
Accumulated depletion, depreciation, amortization and impairment | (35) | (34) |  |
Property and equipment, net | 2,277,992 | 417,533 |  |
Other assets: |  |  |  |
Equity investments and investments in subsidiaries | 40,661 | 33,590 |  |
Long-term derivative instruments | 0 | 0 |  |
Deferred tax asset | 0 | 0 |  |
Other assets | 4,180 | 0 |  |
Total other assets | 44,841 | 33,590 |  |
Total assets | 2,444,638 | 493,172 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 79,964 | 9,158 |  |
Accounts payable - intercompany | 447,577 | 457,163 |  |
Asset retirement obligation—current | 0 | 0 |  |
Derivative instruments | 0 | 0 |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | 527,541 | 466,321 |  |
Long-term derivative instrument | 0 | 0 |  |
Asset retirement obligation—long-term | 6,489 | 0 |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | 534,030 | 466,321 |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | 1,872,598 | 33,822 |  |
Accumulated other comprehensive (loss) income | 0 | 0 |  |
Retained (deficit) earnings | 38,010 | (6,971) |  |
Total stockholders’ equity | 1,910,608 | 26,851 |  |
Total liabilities and stockholders’ equity | 2,444,638 | 493,172 |  |
Reportable Legal Entities | Non-Guarantor |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 1 | 0 | 0 | 1
Restricted Cash |  | 0 |  |
Accounts receivable—oil and gas | 0 | 0 |  |
Accounts receivable - related parties | 0 | 0 |  |
Accounts receivable - intercompany | 0 | 0 |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Short-term derivative instruments | 0 | 0 |  |
Total current assets | 1 | 0 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | 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 | 46,838 | 45,213 |  |
Long-term derivative instruments | 0 | 0 |  |
Deferred tax asset | 0 | 0 |  |
Other assets | 0 | 0 |  |
Total other assets | 46,838 | 45,213 |  |
Total assets | 46,839 | 45,213 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 0 | 0 |  |
Accounts payable - intercompany | 127 | 126 |  |
Asset retirement obligation—current | 0 | 0 |  |
Derivative instruments | 0 | 0 |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | 127 | 126 |  |
Long-term derivative instrument | 0 | 0 |  |
Asset retirement obligation—long-term | 0 | 0 |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | 127 | 126 |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | 257,700 | 257,026 |  |
Accumulated other comprehensive (loss) income | (49,613) | (50,931) |  |
Retained (deficit) earnings | (161,375) | (161,008) |  |
Total stockholders’ equity | 46,712 | 45,087 |  |
Total liabilities and stockholders’ equity | 46,839 | 45,213 |  |
Eliminations |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Restricted Cash |  | 0 |  |
Accounts receivable—oil and gas |  | (37,822) |  |
Accounts receivable - related parties | 0 | 0 |  |
Accounts receivable - intercompany | (482,709) | (450,668) |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Short-term derivative instruments | 0 | 0 |  |
Total current assets | (482,709) | (488,490) |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | (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 | (1,956,591) | (71,210) |  |
Long-term derivative instruments | 0 | 0 |  |
Deferred tax asset | 0 | 0 |  |
Other assets | 0 | 0 |  |
Total other assets | (1,956,591) | (71,210) |  |
Total assets | (2,440,029) | (560,429) |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 0 | 0 |  |
Accounts payable - intercompany | (482,709) | (488,491) |  |
Asset retirement obligation—current | 0 | 0 |  |
Derivative instruments | 0 | 0 |  |
Current maturities of long-term debt | 0 | 0 |  |
Total current liabilities | (482,709) | (488,491) |  |
Long-term derivative instrument | 0 | 0 |  |
Asset retirement obligation—long-term | 0 | 0 |  |
Long-term debt, net of current maturities | 0 | 0 |  |
Total liabilities | (482,709) | (488,491) |  |
Stockholders’ equity: |  |  |  |
Common stock | 0 | 0 |  |
Paid-in capital | (2,130,298) | (290,848) |  |
Accumulated other comprehensive (loss) income | 49,613 | 50,931 |  |
Retained (deficit) earnings | 123,365 | 167,979 |  |
Total stockholders’ equity | (1,957,320) | (71,938) |  |
Total liabilities and stockholders’ equity | $ (2,440,029) | $ (560,429) |  |

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