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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current assets |  |  |  |  |
Cash and cash equivalents |  | $ 13,785 | $ 11,226 | $ 19,397 | $ 9,730
Accounts receivable, net |  | 226,427 | 204,335 |  |
Accounts receivable – affiliates |  | 0 | 0 |  |
Inventory |  | 14,327 | 10,648 |  |
Prepaid expenses |  | 7,176 | 7,623 |  |
Derivative instruments |  | 3,026 | 362 |  |
Other current assets |  | 4,452 | 4,355 |  |
Total current assets |  | 269,193 | 238,549 |  |
Property, plant and equipment |  |  |  |  |
Oil and gas properties (successful efforts method) |  | 7,390,299 | 7,296,568 |  |
Other property and equipment |  | 632,318 | 618,790 |  |
Less: accumulated depreciation, depletion, amortization and impairment |  | (2,126,136) | (1,995,791) |  |
Total property, plant and equipment, net |  | 5,896,481 | 5,919,567 |  |
Assets held for sale |  |  | 0 |  |
Investments in and advances to subsidiaries |  | 0 | 0 |  |
Derivative instruments |  | 3,815 | 0 |  |
Deferred income taxes |  | 0 | 0 |  |
Other assets |  | 20,139 | 20,516 |  |
Total assets | [1] | 6,189,628 | 6,178,632 |  |
Current liabilities |  |  |  |  |
Accounts payable |  | 8,837 | 4,645 |  |
Accounts payable – affiliates |  | 0 | 0 |  |
Revenues and production taxes payable |  | 160,265 | 139,737 |  |
Accrued liabilities |  | 128,241 | 119,173 |  |
Accrued interest payable |  | 20,268 | 39,004 |  |
Derivative instruments |  | 14,627 | 60,469 |  |
Advances from joint interest partners |  | 6,838 | 7,597 |  |
Other current liabilities |  | 13,435 | 10,490 |  |
Total current liabilities |  | 352,511 | 381,115 |  |
Long-term debt |  | 2,305,879 | 2,297,214 |  |
Deferred income taxes |  | 524,842 | 513,529 |  |
Asset retirement obligations |  | 50,088 | 48,985 |  |
Derivative instruments |  | 0 | 11,714 |  |
Other liabilities |  | 2,834 | 2,918 |  |
Total liabilities |  | 3,236,154 | 3,255,475 |  |
Stockholders’ equity |  |  |  |  |
Capital contributions from affiliates |  | 0 | 0 |  |
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,691,038 shares issued and 237,461,470 shares outstanding at March 31, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 |  | 2,344 | 2,331 |  |
Treasury stock, at cost: 1,229,568 and 856,892 shares at March 31, 2017 and December 31, 2016, respectively |  | (21,369) | (15,950) |  |
Additional paid-in capital |  | 2,354,485 | 2,345,271 |  |
Retained earnings |  | 618,014 | 591,505 |  |
Total stockholders’ equity |  | 2,953,474 | 2,923,157 |  |
Total liabilities and stockholders’ equity |  | 6,189,628 | 6,178,632 |  |
Intercompany Eliminations [Member] |  |  |  |  |
Current assets |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 | 0 | 0
Accounts receivable, net |  | 0 | 0 |  |
Accounts receivable – affiliates |  | (233,863) | (279,619) |  |
Inventory |  | 0 | 0 |  |
Prepaid expenses |  | 0 | 0 |  |
Derivative instruments |  | 0 | 0 |  |
Other current assets |  | 0 | 0 |  |
Total current assets |  | (233,863) | (279,619) |  |
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 |  |
Investments in and advances to subsidiaries |  | (4,503,650) | (4,451,192) |  |
Derivative instruments |  | 0 |  |  |
Deferred income taxes |  | (239,419) | (220,058) |  |
Other assets |  | 0 | 0 |  |
Total assets |  | (4,976,932) | (4,950,869) |  |
Current liabilities |  |  |  |  |
Accounts payable |  | 0 | 0 |  |
Accounts payable – affiliates |  | (233,863) | (279,619) |  |
Revenues and production taxes payable |  | 0 | 0 |  |
Accrued liabilities |  | 0 | 0 |  |
Accrued interest payable |  | 0 | 0 |  |
Derivative instruments |  | 0 | 0 |  |
Advances from joint interest partners |  | 0 | 0 |  |
Other current liabilities |  | 0 | 0 |  |
Total current liabilities |  | (233,863) | (279,619) |  |
Long-term debt |  | 0 | 0 |  |
Deferred income taxes |  | (239,419) | (220,058) |  |
Asset retirement obligations |  | 0 | 0 |  |
Derivative instruments |  |  | 0 |  |
Other liabilities |  | 0 | 0 |  |
Total liabilities |  | (473,282) | (499,677) |  |
Stockholders’ equity |  |  |  |  |
Capital contributions from affiliates |  | (3,392,248) | (3,388,893) |  |
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,691,038 shares issued and 237,461,470 shares outstanding at March 31, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 |  | 0 | 0 |  |
Treasury stock, at cost: 1,229,568 and 856,892 shares at March 31, 2017 and December 31, 2016, respectively |  | 0 | 0 |  |
Additional paid-in capital |  | (8,743) | (8,743) |  |
Retained earnings |  | (1,102,659) | (1,053,556) |  |
Total stockholders’ equity |  | (4,503,650) | (4,451,192) |  |
Total liabilities and stockholders’ equity |  | (4,976,932) | (4,950,869) |  |
Parent/Issuer [Member] |  |  |  |  |
Current assets |  |  |  |  |
Cash and cash equivalents |  | 177 | 166 | 90 | 777
Accounts receivable, net |  | 0 | 0 |  |
Accounts receivable – affiliates |  | 200,770 | 252,000 |  |
Inventory |  | 0 | 0 |  |
Prepaid expenses |  | 334 | 275 |  |
Derivative instruments |  | 0 | 0 |  |
Other current assets |  | 2 | 0 |  |
Total current assets |  | 201,283 | 252,441 |  |
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 |  |
Investments in and advances to subsidiaries |  | 4,503,650 | 4,451,192 |  |
Derivative instruments |  | 0 |  |  |
Deferred income taxes |  | 239,419 | 220,058 |  |
Other assets |  | 0 | 0 |  |
Total assets |  | 4,944,352 | 4,923,691 |  |
Current liabilities |  |  |  |  |
Accounts payable |  | 0 | 0 |  |
Accounts payable – affiliates |  | 33,093 | 27,619 |  |
Revenues and production taxes payable |  | 0 | 0 |  |
Accrued liabilities |  | 34 | 12 |  |
Accrued interest payable |  | 19,872 | 38,689 |  |
Derivative instruments |  | 0 | 0 |  |
Advances from joint interest partners |  | 0 | 0 |  |
Other current liabilities |  | 0 | 0 |  |
Total current liabilities |  | 52,999 | 66,320 |  |
Long-term debt |  | 1,937,879 | 1,934,214 |  |
Deferred income taxes |  | 0 | 0 |  |
Asset retirement obligations |  | 0 | 0 |  |
Derivative instruments |  |  | 0 |  |
Other liabilities |  | 0 | 0 |  |
Total liabilities |  | 1,990,878 | 2,000,534 |  |
Stockholders’ equity |  |  |  |  |
Capital contributions from affiliates |  | 0 | 0 |  |
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,691,038 shares issued and 237,461,470 shares outstanding at March 31, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 |  | 2,344 | 2,331 |  |
Treasury stock, at cost: 1,229,568 and 856,892 shares at March 31, 2017 and December 31, 2016, respectively |  | (21,369) | (15,950) |  |
Additional paid-in capital |  | 2,354,485 | 2,345,271 |  |
Retained earnings |  | 618,014 | 591,505 |  |
Total stockholders’ equity |  | 2,953,474 | 2,923,157 |  |
Total liabilities and stockholders’ equity |  | 4,944,352 | 4,923,691 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |  |
Current assets |  |  |  |  |
Cash and cash equivalents |  | 13,608 | 11,060 | $ 19,307 | $ 8,953
Accounts receivable, net |  | 226,427 | 204,335 |  |
Accounts receivable – affiliates |  | 33,093 | 27,619 |  |
Inventory |  | 14,327 | 10,648 |  |
Prepaid expenses |  | 6,842 | 7,348 |  |
Derivative instruments |  | 3,026 | 362 |  |
Other current assets |  | 4,450 | 4,355 |  |
Total current assets |  | 301,773 | 265,727 |  |
Property, plant and equipment |  |  |  |  |
Oil and gas properties (successful efforts method) |  | 7,390,299 | 7,296,568 |  |
Other property and equipment |  | 632,318 | 618,790 |  |
Less: accumulated depreciation, depletion, amortization and impairment |  | (2,126,136) | (1,995,791) |  |
Total property, plant and equipment, net |  | 5,896,481 | 5,919,567 |  |
Assets held for sale |  |  | 0 |  |
Investments in and advances to subsidiaries |  | 0 | 0 |  |
Derivative instruments |  | 3,815 |  |  |
Deferred income taxes |  | 0 | 0 |  |
Other assets |  | 20,139 | 20,516 |  |
Total assets |  | 6,222,208 | 6,205,810 |  |
Current liabilities |  |  |  |  |
Accounts payable |  | 8,837 | 4,645 |  |
Accounts payable – affiliates |  | 200,770 | 252,000 |  |
Revenues and production taxes payable |  | 160,265 | 139,737 |  |
Accrued liabilities |  | 128,207 | 119,161 |  |
Accrued interest payable |  | 396 | 315 |  |
Derivative instruments |  | 14,627 | 60,469 |  |
Advances from joint interest partners |  | 6,838 | 7,597 |  |
Other current liabilities |  | 13,435 | 10,490 |  |
Total current liabilities |  | 533,375 | 594,414 |  |
Long-term debt |  | 368,000 | 363,000 |  |
Deferred income taxes |  | 764,261 | 733,587 |  |
Asset retirement obligations |  | 50,088 | 48,985 |  |
Derivative instruments |  |  | 11,714 |  |
Other liabilities |  | 2,834 | 2,918 |  |
Total liabilities |  | 1,718,558 | 1,754,618 |  |
Stockholders’ equity |  |  |  |  |
Capital contributions from affiliates |  | 3,392,248 | 3,388,893 |  |
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,691,038 shares issued and 237,461,470 shares outstanding at March 31, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 |  | 0 | 0 |  |
Treasury stock, at cost: 1,229,568 and 856,892 shares at March 31, 2017 and December 31, 2016, respectively |  | 0 | 0 |  |
Additional paid-in capital |  | 8,743 | 8,743 |  |
Retained earnings |  | 1,102,659 | 1,053,556 |  |
Total stockholders’ equity |  | 4,503,650 | 4,451,192 |  |
Total liabilities and stockholders’ equity |  | $ 6,222,208 | $ 6,205,810 |  |
[1] | Intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.

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