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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.