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Condensed Consolidating Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Consolidating Balance Sheets | CONDENSED CONSOLIDATING BALANCE SHEETS (Amounts in thousands)
| December 31, 2015
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Assets |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 112,494 |  |  | $ | 479 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 112,974 |
Accounts receivable - oil and gas | 72,241 |  |  | 54 |  |  | — |  |  | (423 | ) |  | 71,872 |
Accounts receivable - related parties | 16 |  |  | — |  |  | — |  |  | — |  |  | 16 |
Accounts receivable - intercompany | 326,475 |  |  | 60 |  |  | — |  |  | (326,535 | ) |  | — |
Prepaid expenses and other current assets | 3,905 |  |  | — |  |  | — |  |  | — |  |  | 3,905 |
Short-term derivative instruments | 142,794 |  |  | — |  |  | — |  |  | — |  |  | 142,794 |
Total current assets | 657,925 |  |  | 593 |  |  | 1 |  |  | (326,958 | ) |  | 331,561 |
Property and equipment: |  |  |  |  |  |  |  |  |
Oil and natural gas properties, full-cost accounting | 5,108,258 |  |  | 316,813 |  |  | — |  |  | (729 | ) |  | 5,424,342 |
Other property and equipment | 33,128 |  |  | 43 |  |  | — |  |  | — |  |  | 33,171 |
Accumulated depletion, depreciation, amortization and impairment | (2,829,081 | ) |  | (29 | ) |  | — |  |  | — |  |  | (2,829,110 | )
Property and equipment, net | 2,312,305 |  |  | 316,827 |  |  | — |  |  | (729 | ) |  | 2,628,403 |
Other assets: |  |  |  |  |  |  |  |  |
Equity investments and investments in subsidiaries | 231,892 |  |  | — |  |  | 50,644 |  |  | (40,143 | ) |  | 242,393 |
Long-term derivative instruments | 51,088 |  |  | — |  |  | — |  |  | — |  |  | 51,088 |
Deferred tax asset | 74,925 |  |  | — |  |  | — |  |  | — |  |  | 74,925 |
Other assets | 6,364 |  |  | — |  |  | — |  |  | — |  |  | 6,364 |
Total other assets | 364,269 |  |  | — |  |  | 50,644 |  |  | (40,143 | ) |  | 374,770 |
Total assets | $ | 3,334,499 |  |  | $ | 317,420 |  |  | $ | 50,645 |  |  | $ | (367,830 | ) |  | $ | 3,334,734 |
Liabilities and Stockholders' Equity |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | $ | 264,893 |  |  | $ | 527 |  |  | $ | — |  |  | $ | (292 | ) |  | $ | 265,128 |
Accounts payable - intercompany | — |  |  | 326,541 |  |  | 124 |  |  | (326,665 | ) |  | — |
Asset retirement obligation - current | 75 |  |  | — |  |  | — |  |  | — |  |  | 75 |
Short-term derivative instruments | 437 |  |  | — |  |  | — |  |  | — |  |  | 437 |
Deferred tax liability | 50,697 |  |  | — |  |  | — |  |  | — |  |  | 50,697 |
Current maturities of long-term debt | 179 |  |  | — |  |  | — |  |  | — |  |  | 179 |
Total current liabilities | 316,281 |  |  | 327,068 |  |  | 124 |  |  | (326,957 | ) |  | 316,516 |
Long-term derivative instrument | 6,935 |  |  | — |  |  | — |  |  | — |  |  | 6,935 |
Asset retirement obligation - long-term | 26,362 |  |  | — |  |  | — |  |  | — |  |  | 26,362 |
Long-term debt, net of current maturities | 946,084 |  |  | — |  |  | — |  |  | — |  |  | 946,084 |
Total liabilities | 1,295,662 |  |  | 327,068 |  |  | 124 |  |  | (326,957 | ) |  | 1,295,897 |
Stockholders' equity: |  |  |  |  |  |  |  |  |
Common stock | 1,082 |  |  | — |  |  | — |  |  | — |  |  | 1,082 |
Paid-in capital | 2,824,303 |  |  | 322 |  |  | 241,553 |  |  | (241,875 | ) |  | 2,824,303 |
Accumulated other comprehensive (loss) income | (55,177 | ) |  | — |  |  | (55,177 | ) |  | 55,177 |  |  | (55,177 | )
Retained (deficit) earnings | (731,371 | ) |  | (9,970 | ) |  | (135,855 | ) |  | 145,825 |  |  | (731,371 | )
Total stockholders' equity | 2,038,837 |  |  | (9,648 | ) |  | 50,521 |  |  | (40,873 | ) |  | 2,038,837 |
Total liabilities and stockholders' equity | $ | 3,334,499 |  |  | $ | 317,420 |  |  | $ | 50,645 |  |  | $ | (367,830 | ) |  | $ | 3,334,734 |
CONDENSED CONSOLIDATING BALANCE SHEETS (Amounts in thousands)
| December 31, 2014
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Assets |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 141,535 |  |  | $ | 804 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 142,340 |
Accounts receivable - oil and gas | 103,762 |  |  | 96 |  |  | — |  |  | — |  |  | 103,858 |
Accounts receivable - related parties | 46 |  |  | — |  |  | — |  |  | — |  |  | 46 |
Accounts receivable - intercompany | 45,222 |  |  | 27 |  |  | — |  |  | (45,249 | ) |  | — |
Prepaid expenses and other current assets | 3,714 |  |  | — |  |  | — |  |  | — |  |  | 3,714 |
Short-term derivative instruments | 78,391 |  |  | — |  |  | — |  |  | — |  |  | 78,391 |
Total current assets | 372,670 |  |  | 927 |  |  | 1 |  |  | (45,249 | ) |  | 328,349 |
Property and equipment: |  |  |  |  |  |  |  |  |
Oil and natural gas properties, full-cost accounting, | 3,887,874 |  |  | 35,990 |  |  | — |  |  | (710 | ) |  | 3,923,154 |
Other property and equipment | 18,301 |  |  | 43 |  |  | — |  |  | — |  |  | 18,344 |
Accumulated depletion, depreciation, amortization and impairment | (1,050,855 | ) |  | (24 | ) |  | — |  |  | — |  |  | (1,050,879 | )
Property and equipment, net | 2,855,320 |  |  | 36,009 |  |  | — |  |  | (710 | ) |  | 2,890,619 |
Other assets: |  |  |  |  |  |  |  |  |
Equity investments and investments in subsidiaries | 360,238 |  |  | — |  |  | 180,217 |  |  | (170,874 | ) |  | 369,581 |
Long-term derivative instruments | 24,448 |  |  | — |  |  | — |  |  | — |  |  | 24,448 |
Other assets | 6,476 |  |  | — |  |  | — |  |  | — |  |  | 6,476 |
Total other assets | 391,162 |  |  | — |  |  | 180,217 |  |  | (170,874 | ) |  | 400,505 |
Total assets | $ | 3,619,152 |  |  | $ | 36,936 |  |  | $ | 180,218 |  |  | $ | (216,833 | ) |  | $ | 3,619,473 |
Liabilities and Stockholders' Equity |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | $ | 371,089 |  |  | $ | 321 |  |  | $ | — |  |  | $ | — |  |  | $ | 371,410 |
Accounts payable - intercompany | — |  |  | 45,143 |  |  | 106 |  |  | (45,249 | ) |  | — |
Asset retirement obligation - current | 75 |  |  | — |  |  | — |  |  | — |  |  | 75 |
Deferred tax liability | 27,070 |  |  | — |  |  | — |  |  | — |  |  | 27,070 |
Current maturities of long-term debt | 168 |  |  | — |  |  | — |  |  | — |  |  | 168 |
Total current liabilities | 398,402 |  |  | 45,464 |  |  | 106 |  |  | (45,249 | ) |  | 398,723 |
Asset retirement obligation - long-term | 17,863 |  |  | — |  |  | — |  |  | — |  |  | 17,863 |
Deferred tax liability | 203,195 |  |  | — |  |  | — |  |  | — |  |  | 203,195 |
Long-term debt, net of current maturities | 703,396 |  |  | — |  |  | — |  |  | — |  |  | 703,396 |
Total liabilities | 1,322,856 |  |  | 45,464 |  |  | 106 |  |  | (45,249 | ) |  | 1,323,177 |
Stockholders' equity: |  |  |  |  |  |  |  |  |
Common stock | 856 |  |  | — |  |  | — |  |  | — |  |  | 856 |
Paid-in capital | 1,828,602 |  |  | 322 |  |  | 227,079 |  |  | (227,401 | ) |  | 1,828,602 |
Accumulated other comprehensive (loss) income | (26,675 | ) |  | — |  |  | (26,675 | ) |  | 26,675 |  |  | (26,675 | )
Retained earnings (deficit) | 493,513 |  |  | (8,850 | ) |  | (20,292 | ) |  | 29,142 |  |  | 493,513 |
Total stockholders' equity | 2,296,296 |  |  | (8,528 | ) |  | 180,112 |  |  | (171,584 | ) |  | 2,296,296 |
Total liabilities and stockholders' equity | $ | 3,619,152 |  |  | $ | 36,936 |  |  | $ | 180,218 |  |  | $ | (216,833 | ) |  | $ | 3,619,473 |
Condensed Consolidating Statements of Operations | CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Amounts in thousands)
| Year Ended December 31, 2015
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Total revenues | $ | 709,525 |  |  | $ | 1,468 |  |  | $ | — |  |  | $ | (1,518 | ) |  | $ | 709,475 |
Costs and expenses: |  |  |  |  |  |  |  |  |
Lease operating expenses | 68,632 |  |  | 843 |  |  | — |  |  | — |  |  | 69,475 |
Production taxes | 14,618 |  |  | 122 |  |  | — |  |  | — |  |  | 14,740 |
Midstream gathering and processing | 138,526 |  |  | 64 |  |  | — |  |  | — |  |  | 138,590 |
Depreciation, depletion and amortization | 337,689 |  |  | 5 |  |  | — |  |  | — |  |  | 337,694 |
Impairment of oil and gas properties | 1,440,418 |  |  | — |  |  | — |  |  | — |  |  | 1,440,418 |
General and administrative | 41,892 |  |  | 55 |  |  | 20 |  |  | — |  |  | 41,967 |
Accretion expense | 820 |  |  | — |  |  | — |  |  | — |  |  | 820 |
| 2,042,595 |  |  | 1,089 |  |  | 20 |  |  | — |  |  | 2,043,704 |
(LOSS) INCOME FROM OPERATIONS | (1,333,070 | ) |  | 379 |  |  | (20 | ) |  | (1,518 | ) |  | (1,334,229 | )
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |
Interest expense | 51,221 |  |  | — |  |  | — |  |  | — |  |  | 51,221 |
Interest income | (643 | ) |  | — |  |  | — |  |  | — |  |  | (643 | )
Insurance proceeds | (10,015 | ) |  | — |  |  | — |  |  | — |  |  | (10,015 | )
Loss (income) from equity method investments and investments in subsidiaries | 107,252 |  |  | — |  |  | 115,544 |  |  | (116,703 | ) |  | 106,093 |
| 147,815 |  |  | — |  |  | 115,544 |  |  | (116,703 | ) |  | 146,656 |
(LOSS) INCOME BEFORE INCOME TAXES | (1,480,885 | ) |  | 379 |  |  | (115,564 | ) |  | 115,185 |  |  | (1,480,885 | )
INCOME TAX BENEFIT | (256,001 | ) |  | — |  |  | — |  |  | — |  |  | (256,001 | )
NET (LOSS) INCOME | $ | (1,224,884 | ) |  | $ | 379 |  |  | $ | (115,564 | ) |  | $ | 115,185 |  |  | $ | (1,224,884 | )
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Amounts in thousands)
| Year Ended December 31, 2014
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Total revenues | $ | 669,067 |  |  | $ | 2,199 |  |  | $ | — |  |  | $ | — |  |  | $ | 671,266 |
Costs and expenses: |  |  |  |  |  |  |  |  |
Lease operating expenses | 51,238 |  |  | 953 |  |  | — |  |  | — |  |  | 52,191 |
Production taxes | 23,803 |  |  | 203 |  |  | — |  |  | — |  |  | 24,006 |
Midstream gathering and processing | 64,402 |  |  | 65 |  |  | — |  |  | — |  |  | 64,467 |
Depreciation, depletion and amortization | 265,428 |  |  | 3 |  |  | — |  |  | — |  |  | 265,431 |
General and administrative | 37,846 |  |  | 446 |  |  | (2 | ) |  | — |  |  | 38,290 |
Accretion expense | 761 |  |  | — |  |  | — |  |  | — |  |  | 761 |
Gain on sale of assets | (11 | ) |  | — |  |  | — |  |  | — |  |  | (11 | )
| 443,467 |  |  | 1,670 |  |  | (2 | ) |  | — |  |  | 445,135 |
INCOME FROM OPERATIONS | 225,600 |  |  | 529 |  |  | 2 |  |  | — |  |  | 226,131 |
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |
Interest expense | 23,986 |  |  | — |  |  | — |  |  | — |  |  | 23,986 |
Interest income | (195 | ) |  | — |  |  | — |  |  | — |  |  | (195 | )
Litigation settlement | 25,500 |  |  | — |  |  | — |  |  | — |  |  | 25,500 |
Gain on contribution of investments | (84,470 | ) |  | — |  |  | — |  |  | — |  |  | (84,470 | )
(Income) loss from equity method investments and investments in subsidiaries | (139,965 | ) |  | — |  |  | 13,159 |  |  | (12,628 | ) |  | (139,434 | )
| (175,144 | ) |  | — |  |  | 13,159 |  |  | (12,628 | ) |  | (174,613 | )
INCOME (LOSS) BEFORE INCOME TAXES | 400,744 |  |  | 529 |  |  | (13,157 | ) |  | 12,628 |  |  | 400,744 |
INCOME TAX EXPENSE | 153,341 |  |  | — |  |  | — |  |  | — |  |  | 153,341 |
NET INCOME (LOSS) | $ | 247,403 |  |  | $ | 529 |  |  | $ | (13,157 | ) |  | $ | 12,628 |  |  | $ | 247,403 |
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Amounts in thousands)
| Year Ended December 31, 2013
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Total revenues | $ | 261,809 |  |  | $ | 1,517 |  |  | $ | — |  |  | $ | (573 | ) |  | $ | 262,753 |
Costs and expenses: |  |  |  |  |  |  |  |  |
Lease operating expenses | 25,971 |  |  | 732 |  |  | — |  |  | — |  |  | 26,703 |
Production taxes | 26,848 |  |  | 85 |  |  | — |  |  | — |  |  | 26,933 |
Midstream gathering and processing | 10,999 |  |  | 31 |  |  | — |  |  | — |  |  | 11,030 |
Depreciation, depletion and amortization | 118,878 |  |  | 2 |  |  | — |  |  | — |  |  | 118,880 |
General and administrative | 22,359 |  |  | 159 |  |  | 1 |  |  | — |  |  | 22,519 |
Accretion expense | 717 |  |  | — |  |  | — |  |  | — |  |  | 717 |
Loss on sale of assets | 508 |  |  | — |  |  | — |  |  | — |  |  | 508 |
| 206,280 |  |  | 1,009 |  |  | 1 |  |  | — |  |  | 207,290 |
INCOME (LOSS) FROM OPERATIONS | 55,529 |  |  | 508 |  |  | (1 | ) |  | (573 | ) |  | 55,463 |
OTHER (INCOME) EXPENSE: |  |  |  |  |  |  |  |  |
Interest expense | 17,490 |  |  | — |  |  | — |  |  | — |  |  | 17,490 |
Interest income | (297 | ) |  | — |  |  | — |  |  | — |  |  | (297 | )
(Income) loss from equity method investments and investments in subsidiaries | (212,992 | ) |  | — |  |  | 2,999 |  |  | (3,065 | ) |  | (213,058 | )
| (195,799 | ) |  | — |  |  | 2,999 |  |  | (3,065 | ) |  | (195,865 | )
INCOME (LOSS) BEFORE INCOME TAXES | 251,328 |  |  | 508 |  |  | (3,000 | ) |  | 2,492 |  |  | 251,328 |
INCOME TAX EXPENSE | 98,136 |  |  | — |  |  | — |  |  | — |  |  | 98,136 |
NET INCOME (LOSS) | $ | 153,192 |  |  | $ | 508 |  |  | $ | (3,000 | ) |  | $ | 2,492 |  |  | $ | 153,192 |
Condensed Consolidating Statements of Comprehensive Income (Loss) |
| Year Ended December 31, 2015
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Net (loss) income | $ | (1,224,884 | ) |  | $ | 379 |  |  | $ | (115,564 | ) |  | $ | 115,185 |  |  | $ | (1,224,884 | )
Foreign currency translation adjustment | (28,502 | ) |  | — |  |  | (28,502 | ) |  | 28,502 |  |  | (28,502 | )
Other comprehensive (loss) income | (28,502 | ) |  | — |  |  | (28,502 | ) |  | 28,502 |  |  | (28,502 | )
Comprehensive (loss) income | $ | (1,253,386 | ) |  | $ | 379 |  |  | $ | (144,066 | ) |  | $ | 143,687 |  |  | $ | (1,253,386 | )
| Year Ended December 31, 2014
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Net income (loss) | $ | 247,403 |  |  | $ | 529 |  |  | $ | (13,157 | ) |  | $ | 12,628 |  |  | $ | 247,403 |
Foreign currency translation adjustment | (16,894 | ) |  | — |  |  | (16,894 | ) |  | 16,894 |  |  | (16,894 | )
Other comprehensive (loss) income | (16,894 | ) |  | — |  |  | (16,894 | ) |  | 16,894 |  |  | (16,894 | )
Comprehensive income (loss) | $ | 230,509 |  |  | $ | 529 |  |  | $ | (30,051 | ) |  | $ | 29,522 |  |  | $ | 230,509 |
| Year Ended December 31, 2013
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Net income (loss) | $ | 153,192 |  |  | $ | 508 |  |  | $ | (3,000 | ) |  | $ | 2,492 |  |  | $ | 153,192 |
Foreign currency translation adjustment | (12,223 | ) |  | — |  |  | (12,223 | ) |  | 12,223 |  |  | (12,223 | )
Change in fair value of derivative instruments, net of taxes | (4,419 | ) |  | — |  |  | — |  |  | — |  |  | (4,419 | )
Reclassification of settled contracts, net of taxes | 10,290 |  |  | — |  |  | — |  |  | — |  |  | 10,290 |
Other comprehensive (loss) income | (6,352 | ) |  | — |  |  | (12,223 | ) |  | 12,223 |  |  | (6,352 | )
Comprehensive income (loss) | $ | 146,840 |  |  | $ | 508 |  |  | $ | (15,223 | ) |  | $ | 14,715 |  |  | $ | 146,840 |
Condensed Consolidating Statements of Cash Flows |
| Year Ended December 31, 2015
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Net cash provided by (used in) operating activities | $ | 344,018 |  |  | $ | (21,839 | ) |  | $ | (2 | ) |  | $ | 2 |  |  | $ | 322,179 |
Net cash (used in) provided by investing activities | (1,595,767 | ) |  | 21,514 |  |  | (14,472 | ) |  | 14,472 |  |  | (1,574,253 | )
Net cash provided by (used in) financing activities | 1,222,708 |  |  | — |  |  | 14,474 |  |  | (14,474 | ) |  | 1,222,708 |
Net decrease in cash and cash equivalents | (29,041 | ) |  | (325 | ) |  | — |  |  | — |  |  | (29,366 | )
Cash and cash equivalents at beginning of period | 141,535 |  |  | 804 |  |  | 1 |  |  | — |  |  | 142,340 |
Cash and cash equivalents at end of period | $ | 112,494 |  |  | $ | 479 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 112,974 |
| Year Ended December 31, 2014
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Net cash provided by (used in) operating activities | $ | 388,177 |  |  | $ | 21,698 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 409,873 |
Net cash (used in) provided by investing activities | (1,108,241 | ) |  | (28,419 | ) |  | (18,799 | ) |  | 18,802 |  |  | (1,136,657 | )
Net cash provided by (used in) financing activities | 410,168 |  |  | — |  |  | 18,802 |  |  | (18,802 | ) |  | 410,168 |
Net (decrease) increase in cash and cash equivalents | (309,896 | ) |  | (6,721 | ) |  | 1 |  |  | — |  |  | (316,616 | )
Cash and cash equivalents at beginning of period | 451,431 |  |  | 7,525 |  |  | — |  |  | — |  |  | 458,956 |
Cash and cash equivalents at end of period | $ | 141,535 |  |  | $ | 804 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 142,340 |
| Year Ended December 31, 2013
| Parent |  | Guarantors |  | Non-Guarantor |  | Eliminations |  | Consolidated
Net cash provided by operating activities | $ | 182,961 |  |  | $ | 8,104 |  |  | $ | — |  |  | $ | — |  |  | $ | 191,065 |
Net cash (used in) provided by investing activities | (661,886 | ) |  | (2,374 | ) |  | (33,929 | ) |  | 33,929 |  |  | (664,260 | )
Net cash provided by (used in) financing activities | 765,063 |  |  | — |  |  | 33,929 |  |  | (33,929 | ) |  | 765,063 |
Net increase in cash and cash equivalents | 286,138 |  |  | 5,730 |  |  | — |  |  | — |  |  | 291,868 |
Cash and cash equivalents at beginning of period | 165,293 |  |  | 1,795 |  |  | — |  |  | — |  |  | 167,088 |
Cash and cash equivalents at end of period | $ | 451,431 |  |  | $ | 7,525 |  |  | $ | — |  |  | $ | — |  |  | $ | 458,956 |

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