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Condensed Consolidated Statements Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 21, 2015 | May 29, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net (loss) income |  |  | $ (97,057) | $ (679,524) | $ 110,754
Unrealized (loss) gain on derivatives |  |  | (41,238) | (39,265) | 58,302
Depletion, depreciation and amortization |  |  | 122,048 | 178,847 | 134,737
Accretion of asset retirement obligations |  |  | 1,182 | 734 | 504
Full-cost ceiling impairment |  |  | 158,633 | 801,166 | 0
Stock-based compensation expense |  |  | 12,362 | 9,450 | 5,524
Deferred income tax (benefit) provision |  |  | 0 | (150,327) | 64,242
Amortization of debt issuance cost |  |  | 1,148 | 852 | 0
Net gain on asset sales and inventory impairment |  |  | (107,277) | (908) | 0
Accounts receivable |  |  | (14,259) | 3,633 | (13,318)
Lease and well equipment inventory |  |  | (700) | (180) | (211)
Prepaid expenses |  |  | (124) | (544) | (783)
Other assets |  |  | 490 | (552) | 1,212
Accounts payable, accrued liabilities and other current liabilities |  |  | 6,611 | 1,375 | 607
Royalties payable |  |  | 7,495 | 1,654 | 6,663
Advances from joint interest owners |  |  | 1,000 | 700 | 0
Income taxes payable |  |  | (2,848) | 2,405 | 39
Other long-term liabilities |  |  | 4,144 | 489 | (187)
Net cash provided by operating activities |  |  | 134,086 | 208,535 | 251,481
Proceeds from sale of assets |  |  | 5,173 | 139,836 | 79
Oil and natural gas properties capital expenditures |  |  | (379,067) | (432,715) | (560,849)
Expenditures for other property and equipment |  |  | (74,845) | (64,499) | (9,152)
Business combination, net of cash acquired |  |  | 0 | (24,028) | 0
Restricted cash |  |  | 43,098 | (43,098) | 0
Restricted cash in less-than-wholly-owned subsidiaries |  |  | 1 | (650) | (609)
Net cash used in investing activities |  |  | (405,640) | (425,154) | (570,531)
Repayments of borrowings |  |  | (120,000) | (476,982) | (180,000)
Borrowings under Credit Agreement |  |  | 120,000 | 125,000 | 320,000
Proceeds from issuance of common stock | $ 187,600 | $ 181,300 | 288,510 | 188,720 | 181,875
Proceeds from issuance of senior unsecured notes |  |  | 184,625 | 400,000 | 0
Cost to issue equity |  |  | (847) | (1,158) | (590)
Cost to issue senior unsecured notes |  |  | (2,734) | (9,598) | 0
Proceeds from stock options exercised |  |  | 100 | 10 | 43
Capital contribution from non-controlling interest owners in less-than-wholly-owned subsidiaries |  |  | 0 | 562 | 150
Taxes paid related to net share settlement of stock-based compensation |  |  | (1,948) | (1,610) | (308)
Net cash provided by financing activities |  |  | 467,706 | 224,944 | 321,170
Increase in cash |  |  | 196,152 | 8,325 | 2,120
Cash at beginning of year |  |  | 16,732 | 8,407 | 6,287
Cash at end of year |  |  | 212,884 | 16,732 | 8,407
Adjustment [Member] | Consolidation, Eliminations [Member] |  |  |  |  |
Net cash provided by operating activities |  |  | 0 | 0 | 0
Net cash used in investing activities |  |  | 384,801 | 563,505 | 173,949
Net cash provided by financing activities |  |  | (384,801) | (563,505) | (173,949)
Increase in cash |  |  | 0 | 0 | 0
Cash at beginning of year |  |  | 0 | 0 | 0
Cash at end of year |  |  | 0 | 0 | 0
Adjustment [Member] | Parent |  |  |  |  |
Net cash provided by operating activities |  |  | (45,215) | (31,271) | (8,607)
Net cash used in investing activities |  |  | (324,724) | (546,715) | (172,749)
Net cash provided by financing activities |  |  | 469,654 | 577,973 | 181,328
Increase in cash |  |  | 99,715 | (13) | (28)
Cash at beginning of year |  |  | 80 | 93 | 121
Cash at end of year |  |  | 99,795 | 80 | 93
Adjustment [Member] | Non-Guarantor Subsidiaries |  |  |  |  |
Net cash provided by operating activities |  |  | 6,694 | 13,916 | 431
Net cash used in investing activities |  |  | (64,683) | (31,101) | (1,763)
Net cash provided by financing activities |  |  | 60,110 | 17,353 | 1,350
Increase in cash |  |  | 2,121 | 168 | 18
Cash at beginning of year |  |  | 186 | 18 | 0
Cash at end of year |  |  | 2,307 | 186 | 18
Adjustment [Member] | Existing Guarantor Subsidiaries |  |  |  |  |
Net cash provided by operating activities |  |  | 172,607 | 225,890 | 259,657
Net cash used in investing activities |  |  | (401,034) | (410,843) | (569,968)
Net cash provided by financing activities |  |  | 322,743 | 193,123 | 312,441
Increase in cash |  |  | 94,316 | 8,170 | 2,130
Cash at beginning of year |  |  | 16,466 | 8,296 | 6,166
Cash at end of year |  |  | 110,782 | 16,466 | 8,296
Adjustment [Member] | Consolidated Entity |  |  |  |  |
Net cash provided by operating activities |  |  | 134,086 | 208,535 | 251,481
Net cash used in investing activities |  |  | (405,640) | (425,154) | (570,531)
Net cash provided by financing activities |  |  | 467,706 | 224,944 | 321,170
Increase in cash |  |  | 196,152 | 8,325 | 2,120
Cash at beginning of year |  |  | 16,732 | 8,407 | 6,287
Cash at end of year |  |  | $ 212,884 | $ 16,732 | $ 8,407

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Amount of cash outflow from the acquisition of or improvements to long-lived, physical assets used to produce goods and services and not intended for resale, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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- Definition Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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