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Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 396,437 | $ 112,974 | $ 525,488 | $ 142,340
Accounts receivable—oil and gas | 91,462 | 71,872 |  |
Accounts receivable - related parties | 23 | 16 |  |
Accounts receivable - intercompany |  | 0 |  |
Prepaid expenses and other current assets | 7,782 | 3,905 |  |
Short-term derivative instruments | 44,672 | 142,794 |  |
Deferred Tax Assets, Net, Current | 292 | 0 |  |
Total current assets | 540,668 | 331,561 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | 5,686,188 | 5,424,342 |  |
Other property and equipment | 48,107 | 33,171 |  |
Accumulated depletion, depreciation, amortization and impairment | (3,339,087) | (2,829,110) |  |
Property and equipment, net | 2,395,208 | 2,628,403 |  |
Other assets: |  |  |  |
Equity investments | 253,047 | 242,393 |  |
Long-term derivative instruments | 14,644 | 51,088 |  |
Deferred tax asset | 24,284 | 74,925 |  |
Other assets | 11,336 | 6,364 |  |
Total other assets | 303,311 | 374,770 |  |
Total assets | 3,239,187 | 3,334,734 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 289,750 | 265,128 |  |
Accounts payable - intercompany | 0 | 0 |  |
Asset retirement obligation—current | 75 | 75 | 75 |
Short-term derivative instruments | 49,906 | 437 |  |
Deferred tax liability | 0 | 50,697 |  |
Current maturities of long-term debt | 0 | 179 |  |
Total current liabilities | 339,731 | 316,516 |  |
Long-term derivative instrument | 29,269 | 6,935 |  |
Asset retirement obligation—long-term | 29,993 | 26,362 | 21,202 |
Asset retirement obligation - long-term |  | 26,362 |  |
Long-term debt | 956,754 | 946,084 |  |
Total liabilities | 1,355,747 | 1,295,897 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,253 | 1,082 |  |
Paid-in capital | 3,242,404 | 2,824,303 |  |
Accumulated other comprehensive (loss) income | (46,803) | (55,177) |  |
Retained (deficit) earnings | (1,313,414) | (731,371) |  |
Total stockholders’ equity | 1,883,440 | 2,038,837 | 3,267,306 | 2,296,296
Total liabilities and stockholders’ equity | 3,239,187 | 3,334,734 |  |
Parent |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 395,703 | 112,494 | 524,240 | 141,535
Accounts receivable—oil and gas | 90,758 | 72,241 |  |
Accounts receivable - related parties | 23 | 16 |  |
Accounts receivable - intercompany | 355,924 | 326,475 |  |
Prepaid expenses and other current assets | 7,782 | 3,905 |  |
Short-term derivative instruments | 44,672 | 142,794 |  |
Deferred Tax Assets, Net, Current | 292 |  |  |
Total current assets | 895,154 | 657,925 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | 5,334,096 | 5,108,258 |  |
Other property and equipment | 48,064 | 33,128 |  |
Accumulated depletion, depreciation, amortization and impairment | (3,339,056) | (2,829,081) |  |
Property and equipment, net | 2,043,104 | 2,312,305 |  |
Other assets: |  |  |  |
Equity investments | 242,627 | 231,892 |  |
Long-term derivative instruments | 14,644 | 51,088 |  |
Deferred tax asset | 24,284 | 74,925 |  |
Other assets | 11,336 | 6,364 |  |
Total other assets | 292,891 | 364,269 |  |
Total assets | 3,231,149 | 3,334,499 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 281,712 | 264,893 |  |
Accounts payable - intercompany | 0 |  |  |
Asset retirement obligation—current | 75 | 75 |  |
Short-term derivative instruments | 49,906 | 437 |  |
Deferred tax liability |  | 50,697 |  |
Current maturities of long-term debt |  | 179 |  |
Total current liabilities | 331,693 | 316,281 |  |
Long-term derivative instrument | 29,269 | 6,935 |  |
Asset retirement obligation—long-term | 29,993 |  |  |
Asset retirement obligation - long-term |  | 26,362 |  |
Long-term debt | 956,754 | 946,084 |  |
Total liabilities | 1,347,709 | 1,295,662 |  |
Stockholders’ equity: |  |  |  |
Common stock | 1,253 | 1,082 |  |
Paid-in capital | 3,242,404 | 2,824,303 |  |
Accumulated other comprehensive (loss) income | (46,803) | (55,177) |  |
Retained (deficit) earnings | (1,313,414) | (731,371) |  |
Total stockholders’ equity | 1,883,440 | 2,038,837 |  |
Total liabilities and stockholders’ equity | 3,231,149 | 3,334,499 |  |
Guarantors |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 733 | 479 | 1,247 | 804
Accounts receivable—oil and gas | 7,721 | 54 |  |
Accounts receivable - related parties | 0 | 0 |  |
Accounts receivable - intercompany | 1,904 | 60 |  |
Prepaid expenses and other current assets |  | 0 |  |
Short-term derivative instruments | 0 | 0 |  |
Deferred Tax Assets, Net, Current | 0 |  |  |
Total current assets | 10,358 | 593 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | 352,821 | 316,813 |  |
Other property and equipment | 43 | 43 |  |
Accumulated depletion, depreciation, amortization and impairment | (31) | (29) |  |
Property and equipment, net | 352,833 | 316,827 |  |
Other assets: |  |  |  |
Equity investments | 25,441 | 0 |  |
Long-term derivative instruments | 0 | 0 |  |
Deferred tax asset | 0 | 0 |  |
Other assets |  | 0 |  |
Total other assets | 25,441 |  |  |
Total assets | 388,632 | 317,420 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 16,768 | 527 |  |
Accounts payable - intercompany | 355,991 | 326,541 |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments |  | 0 |  |
Deferred tax liability |  | 0 |  |
Current maturities of long-term debt |  | 0 |  |
Total current liabilities | 372,759 | 327,068 |  |
Long-term derivative instrument | 0 | 0 |  |
Asset retirement obligation—long-term | 0 |  |  |
Asset retirement obligation - long-term |  | 0 |  |
Long-term debt | 0 | 0 |  |
Total liabilities | 372,759 | 327,068 |  |
Stockholders’ equity: |  |  |  |
Common stock |  | 0 |  |
Paid-in capital | 25,822 | 322 |  |
Accumulated other comprehensive (loss) income |  | 0 |  |
Retained (deficit) earnings | (9,949) | (9,970) |  |
Total stockholders’ equity | 15,873 | (9,648) |  |
Total liabilities and stockholders’ equity | 388,632 | 317,420 |  |
Non-Guarantor |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 1 | 1 | 1 | 1
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 |  |
Deferred Tax Assets, Net, Current | 0 |  |  |
Total current assets | 1 | 1 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties |  | 0 |  |
Other property and equipment |  | 0 |  |
Accumulated depletion, depreciation, amortization and impairment |  | 0 |  |
Property and equipment, net |  | 0 |  |
Other assets: |  |  |  |
Equity investments | 49,557 | 50,644 |  |
Long-term derivative instruments | 0 | 0 |  |
Deferred tax asset | 0 | 0 |  |
Other assets |  | 0 |  |
Total other assets | 49,557 | 50,644 |  |
Total assets | 49,558 | 50,645 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities |  | 0 |  |
Accounts payable - intercompany | 125 | 124 |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments |  | 0 |  |
Deferred tax liability |  | 0 |  |
Current maturities of long-term debt |  | 0 |  |
Total current liabilities | 125 | 124 |  |
Long-term derivative instrument | 0 | 0 |  |
Asset retirement obligation—long-term | 0 |  |  |
Asset retirement obligation - long-term |  | 0 |  |
Long-term debt | 0 | 0 |  |
Total liabilities | 125 | 124 |  |
Stockholders’ equity: |  |  |  |
Common stock |  | 0 |  |
Paid-in capital | 255,244 | 241,553 |  |
Accumulated other comprehensive (loss) income | (45,507) | (55,177) |  |
Retained (deficit) earnings | (160,304) | (135,855) |  |
Total stockholders’ equity | 49,433 | 50,521 |  |
Total liabilities and stockholders’ equity | 49,558 | 50,645 |  |
Eliminations |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Accounts receivable—oil and gas | (7,017) | (423) |  |
Accounts receivable - related parties | 0 | 0 |  |
Accounts receivable - intercompany | (357,828) | (326,535) |  |
Prepaid expenses and other current assets |  | 0 |  |
Short-term derivative instruments | 0 | 0 |  |
Deferred Tax Assets, Net, Current | 0 |  |  |
Total current assets | (364,845) | (326,958) |  |
Property and equipment: |  |  |  |
Oil and natural gas properties | (729) | (729) |  |
Other property and equipment |  | 0 |  |
Accumulated depletion, depreciation, amortization and impairment |  | 0 |  |
Property and equipment, net | (729) | (729) |  |
Other assets: |  |  |  |
Equity investments | (64,578) | (40,143) |  |
Long-term derivative instruments | 0 | 0 |  |
Deferred tax asset | 0 | 0 |  |
Other assets |  | 0 |  |
Total other assets | (64,578) | (40,143) |  |
Total assets | (430,152) | (367,830) |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | (8,730) | (292) |  |
Accounts payable - intercompany | (356,116) | (326,665) |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments |  | 0 |  |
Deferred tax liability |  | 0 |  |
Current maturities of long-term debt |  | 0 |  |
Total current liabilities | (364,846) | (326,957) |  |
Long-term derivative instrument | 0 | 0 |  |
Asset retirement obligation—long-term | 0 |  |  |
Asset retirement obligation - long-term |  | 0 |  |
Long-term debt | 0 | 0 |  |
Total liabilities | (364,846) | (326,957) |  |
Stockholders’ equity: |  |  |  |
Common stock |  | 0 |  |
Paid-in capital | (281,066) | (241,875) |  |
Accumulated other comprehensive (loss) income | 45,507 | 55,177 |  |
Retained (deficit) earnings | 170,253 | 145,825 |  |
Total stockholders’ equity | (65,306) | (40,873) |  |
Total liabilities and stockholders’ equity | $ (430,152) | $ (367,830) |  |

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