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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 19,397 | $ 9,730 | $ 10,188 | $ 45,811
Accounts receivable – oil and gas revenues | 92,684 | 96,495 |  |
Accounts receivable – joint interest and other | 104,512 | 100,914 |  |
Accounts receivable – affiliates | 0 | 0 |  |
Inventory | 10,723 | 11,072 |  |
Prepaid expenses | 7,411 | 7,328 |  |
Derivative instruments | 91,590 | 139,697 |  |
Other current assets | 46 | 50 |  |
Total current assets | 326,363 | 365,286 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 6,327,027 | 6,284,401 |  |
Other property and equipment | 477,343 | 443,265 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,627,201) | (1,509,424) |  |
Total property, plant and equipment, net | 5,177,169 | 5,218,242 |  |
Assets held for sale | 25,845 | 26,728 |  |
Investments in and advances to subsidiaries | 0 | 0 |  |
Derivative instruments | 7,521 | 15,776 |  |
Deferred income taxes | 0 | 0 |  |
Other assets | 23,370 | 23,343 |  |
Total assets | 5,560,268 | 5,649,375 |  |
Current liabilities |  |  |  |
Accounts payable | 10,101 | 9,983 |  |
Accounts payable – affiliates | 0 | 0 |  |
Revenues and production taxes payable | 115,412 | 132,356 |  |
Accrued liabilities | 126,765 | 167,669 |  |
Accrued interest payable | 24,277 | 49,413 |  |
Derivative instruments | 1,018 | 0 |  |
Advances from joint interest partners | 4,390 | 4,647 |  |
Other current liabilities | 500 | 6,500 |  |
Total current liabilities | 282,463 | 370,568 |  |
Long-term debt | 2,201,938 | 2,302,584 |  |
Deferred income taxes | 580,526 | 608,155 |  |
Asset retirement obligations | 36,088 | 35,338 |  |
Liabilities held for sale | 10,155 | 10,228 |  |
Derivative instruments | 1,558 | 0 |  |
Other liabilities | 3,091 | 3,160 |  |
Total liabilities | 3,115,819 | 3,330,033 |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | 0 | 0 |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 181,298,001 shares issued and 180,582,855 shares outstanding at March 31, 2016 and 139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 | 1,774 | 1,376 |  |
Treasury stock, at cost: 715,146 and 507,926 shares at March 21, 2016 and December 31, 2015, respectively | (14,652) | (13,620) |  |
Additional paid-in capital | 1,687,261 | 1,497,065 |  |
Retained earnings | 770,066 | 834,521 |  |
Total stockholders’ equity | 2,444,449 | 2,319,342 |  |
Total liabilities and stockholders’ equity | 5,560,268 | 5,649,375 |  |
Parent/Issuer [Member] |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 90 | 777 | 774 | 776
Accounts receivable – oil and gas revenues | 0 | 0 |  |
Accounts receivable – joint interest and other | 0 | 15 |  |
Accounts receivable – affiliates | 1,348 | 1,248 |  |
Inventory | 0 | 0 |  |
Prepaid expenses | 139 | 278 |  |
Derivative instruments | 0 | 0 |  |
Other current assets | 0 | 0 |  |
Total current assets | 1,577 | 2,318 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 0 | 0 |  |
Other property and equipment | 0 | 0 |  |
Less: accumulated depreciation, depletion, amortization and impairment | 0 | 0 |  |
Total property, plant and equipment, net | 0 | 0 |  |
Assets held for sale | 0 | 0 |  |
Investments in and advances to subsidiaries | 4,541,136 | 4,573,172 |  |
Derivative instruments | 0 | 0 |  |
Deferred income taxes | 213,270 | 205,174 |  |
Other assets | 0 | 100 |  |
Total assets | 4,755,983 | 4,780,764 |  |
Current liabilities |  |  |  |
Accounts payable | 0 | 0 |  |
Accounts payable – affiliates | 150,125 | 247,488 |  |
Revenues and production taxes payable | 0 | 0 |  |
Accrued liabilities | 216 | 10 |  |
Accrued interest payable | 24,255 | 49,340 |  |
Derivative instruments | 0 |  |  |
Advances from joint interest partners | 0 | 0 |  |
Other current liabilities | 0 | 0 |  |
Total current liabilities | 174,596 | 296,838 |  |
Long-term debt | 2,136,938 | 2,164,584 |  |
Deferred income taxes | 0 | 0 |  |
Asset retirement obligations | 0 | 0 |  |
Liabilities held for sale | 0 | 0 |  |
Derivative instruments | 0 |  |  |
Other liabilities | 0 | 0 |  |
Total liabilities | 2,311,534 | 2,461,422 |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | 0 | 0 |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 181,298,001 shares issued and 180,582,855 shares outstanding at March 31, 2016 and 139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 | 1,774 | 1,376 |  |
Treasury stock, at cost: 715,146 and 507,926 shares at March 21, 2016 and December 31, 2015, respectively | (14,652) | (13,620) |  |
Additional paid-in capital | 1,687,261 | 1,497,065 |  |
Retained earnings | 770,066 | 834,521 |  |
Total stockholders’ equity | 2,444,449 | 2,319,342 |  |
Total liabilities and stockholders’ equity | 4,755,983 | 4,780,764 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 19,307 | 8,953 | 9,414 | 45,035
Accounts receivable – oil and gas revenues | 92,684 | 96,495 |  |
Accounts receivable – joint interest and other | 104,512 | 100,899 |  |
Accounts receivable – affiliates | 150,125 | 247,488 |  |
Inventory | 10,723 | 11,072 |  |
Prepaid expenses | 7,272 | 7,050 |  |
Derivative instruments | 91,590 | 139,697 |  |
Other current assets | 46 | 50 |  |
Total current assets | 476,259 | 611,704 |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 6,327,027 | 6,284,401 |  |
Other property and equipment | 477,343 | 443,265 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,627,201) | (1,509,424) |  |
Total property, plant and equipment, net | 5,177,169 | 5,218,242 |  |
Assets held for sale | 25,845 | 26,728 |  |
Investments in and advances to subsidiaries | 0 | 0 |  |
Derivative instruments | 7,521 | 15,776 |  |
Deferred income taxes | 0 | 0 |  |
Other assets | 23,370 | 23,243 |  |
Total assets | 5,710,164 | 5,895,693 |  |
Current liabilities |  |  |  |
Accounts payable | 10,101 | 9,983 |  |
Accounts payable – affiliates | 1,348 | 1,248 |  |
Revenues and production taxes payable | 115,412 | 132,356 |  |
Accrued liabilities | 126,549 | 167,659 |  |
Accrued interest payable | 22 | 73 |  |
Derivative instruments | 1,018 |  |  |
Advances from joint interest partners | 4,390 | 4,647 |  |
Other current liabilities | 500 | 6,500 |  |
Total current liabilities | 259,340 | 322,466 |  |
Long-term debt | 65,000 | 138,000 |  |
Deferred income taxes | 793,796 | 813,329 |  |
Asset retirement obligations | 36,088 | 35,338 |  |
Liabilities held for sale | 10,155 | 10,228 |  |
Derivative instruments | 1,558 |  |  |
Other liabilities | 3,091 | 3,160 |  |
Total liabilities | 1,169,028 | 1,322,521 |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | 3,375,186 | 3,369,895 |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 181,298,001 shares issued and 180,582,855 shares outstanding at March 31, 2016 and 139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 | 0 | 0 |  |
Treasury stock, at cost: 715,146 and 507,926 shares at March 21, 2016 and December 31, 2015, respectively | 0 | 0 |  |
Additional paid-in capital | 8,743 | 8,743 |  |
Retained earnings | 1,157,207 | 1,194,534 |  |
Total stockholders’ equity | 4,541,136 | 4,573,172 |  |
Total liabilities and stockholders’ equity | 5,710,164 | 5,895,693 |  |
Intercompany Eliminations [Member] |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Accounts receivable – oil and gas revenues | 0 | 0 |  |
Accounts receivable – joint interest and other | 0 | 0 |  |
Accounts receivable – affiliates | (151,473) | (248,736) |  |
Inventory | 0 | 0 |  |
Prepaid expenses | 0 | 0 |  |
Derivative instruments | 0 | 0 |  |
Other current assets | 0 | 0 |  |
Total current assets | (151,473) | (248,736) |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 0 | 0 |  |
Other property and equipment | 0 | 0 |  |
Less: accumulated depreciation, depletion, amortization and impairment | 0 | 0 |  |
Total property, plant and equipment, net | 0 | 0 |  |
Assets held for sale | 0 | 0 |  |
Investments in and advances to subsidiaries | (4,541,136) | (4,573,172) |  |
Derivative instruments | 0 | 0 |  |
Deferred income taxes | (213,270) | (205,174) |  |
Other assets | 0 | 0 |  |
Total assets | (4,905,879) | (5,027,082) |  |
Current liabilities |  |  |  |
Accounts payable | 0 | 0 |  |
Accounts payable – affiliates | (151,473) | (248,736) |  |
Revenues and production taxes payable | 0 | 0 |  |
Accrued liabilities | 0 | 0 |  |
Accrued interest payable | 0 | 0 |  |
Derivative instruments | 0 |  |  |
Advances from joint interest partners | 0 | 0 |  |
Other current liabilities | 0 | 0 |  |
Total current liabilities | (151,473) | (248,736) |  |
Long-term debt | 0 | 0 |  |
Deferred income taxes | (213,270) | (205,174) |  |
Asset retirement obligations | 0 | 0 |  |
Liabilities held for sale | 0 | 0 |  |
Derivative instruments | 0 |  |  |
Other liabilities | 0 | 0 |  |
Total liabilities | (364,743) | (453,910) |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | (3,375,186) | (3,369,895) |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 181,298,001 shares issued and 180,582,855 shares outstanding at March 31, 2016 and 139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 | 0 | 0 |  |
Treasury stock, at cost: 715,146 and 507,926 shares at March 21, 2016 and December 31, 2015, respectively | 0 | 0 |  |
Additional paid-in capital | (8,743) | (8,743) |  |
Retained earnings | (1,157,207) | (1,194,534) |  |
Total stockholders’ equity | (4,541,136) | (4,573,172) |  |
Total liabilities and stockholders’ equity | $ (4,905,879) | $ (5,027,082) |  |

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