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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Current assets        
Cash and cash equivalents $ 13,776 $ 9,730 $ 12,265 $ 45,811
Accounts receivable – oil and gas revenues 103,128 96,495    
Accounts receivable – joint interest and other 77,903 100,914    
Accounts receivable – affiliates 0 0    
Inventory 8,513 11,072    
Prepaid expenses 6,093 7,328    
Derivative instruments 9,142 139,697    
Other current assets 4,290 50    
Total current assets 222,845 365,286    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 6,438,782 6,284,401    
Other property and equipment 580,171 443,265    
Less: accumulated depreciation, depletion, amortization and impairment (1,866,280) (1,509,424)    
Total property, plant and equipment, net 5,152,673 5,218,242    
Assets held for sale 0 26,728    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 194 15,776    
Deferred income taxes 0 0    
Other assets 22,549 23,343    
Total assets 5,398,261 5,649,375    
Current liabilities        
Accounts payable 7,929 9,983    
Accounts payable – affiliates 0 0    
Revenues and production taxes payable 141,991 132,356    
Accrued liabilities 98,926 167,669    
Accrued interest payable 19,798 49,413    
Derivative instruments 17,308 0    
Advances from joint interest partners 5,191 4,647    
Other current liabilities   6,500    
Total current liabilities 291,143 370,568    
Long-term debt 2,125,573 2,302,584    
Deferred income taxes 546,202 608,155    
Asset retirement obligations 37,092 35,338    
Liabilities held for sale 0 10,228    
Derivative instruments 7,755 0    
Other liabilities 2,992 3,160    
Total liabilities 3,010,757 3,330,033    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized,181,200,581 shares issued and 180,399,060 shares outstanding at June 30, 2016; 300,000,000 shares authorized,139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 1,779 1,376    
Treasury stock, at cost: 801,521 and 507,926 shares at June 30, 2016 and December 31, 2015, respectively (15,895) (13,620)    
Additional paid-in capital 1,755,427 1,497,065    
Retained earnings 646,193 834,521    
Total stockholders’ equity 2,387,504 2,319,342    
Total liabilities and stockholders’ equity 5,398,261 5,649,375    
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 (348,679) (248,736)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments 0 0    
Other current assets 0 0    
Total current assets (348,679) (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    
Investments in and advances to subsidiaries (4,478,149) (4,573,172)    
Derivative instruments 0 0    
Deferred income taxes (205,200) (205,174)    
Other assets 0 0    
Total assets (5,032,028) (5,027,082)    
Current liabilities        
Accounts payable 0 0    
Accounts payable – affiliates (348,679) (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 (348,679) (248,736)    
Long-term debt 0 0    
Deferred income taxes (205,200) (205,174)    
Asset retirement obligations 0 0    
Liabilities held for sale   0    
Derivative instruments 0      
Other liabilities 0 0    
Total liabilities (553,879) (453,910)    
Stockholders’ equity        
Capital contributions from affiliates (3,385,326) (3,369,895)    
Common stock, $0.01 par value: 450,000,000 shares authorized,181,200,581 shares issued and 180,399,060 shares outstanding at June 30, 2016; 300,000,000 shares authorized,139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 0 0    
Treasury stock, at cost: 801,521 and 507,926 shares at June 30, 2016 and December 31, 2015, respectively 0 0    
Additional paid-in capital (8,743) (8,743)    
Retained earnings (1,084,080) (1,194,534)    
Total stockholders’ equity (4,478,149) (4,573,172)    
Total liabilities and stockholders’ equity (5,032,028) (5,027,082)    
Parent/Issuer [Member]        
Current assets        
Cash and cash equivalents 90 777 757 776
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 413 278    
Derivative instruments 0 0    
Other current assets 0 0    
Total current assets 1,851 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    
Investments in and advances to subsidiaries 4,478,149 4,573,172    
Derivative instruments 0 0    
Deferred income taxes 205,200 205,174    
Other assets 0 100    
Total assets 4,685,200 4,780,764    
Current liabilities        
Accounts payable 0 0    
Accounts payable – affiliates 347,331 247,488    
Revenues and production taxes payable 0 0    
Accrued liabilities 27 10    
Accrued interest payable 19,765 49,340    
Derivative instruments 0      
Advances from joint interest partners 0 0    
Other current liabilities 0 0    
Total current liabilities 367,123 296,838    
Long-term debt 1,930,573 2,164,584    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Liabilities held for sale   0    
Derivative instruments 0      
Other liabilities 0 0    
Total liabilities 2,297,696 2,461,422    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized,181,200,581 shares issued and 180,399,060 shares outstanding at June 30, 2016; 300,000,000 shares authorized,139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 1,779 1,376    
Treasury stock, at cost: 801,521 and 507,926 shares at June 30, 2016 and December 31, 2015, respectively (15,895) (13,620)    
Additional paid-in capital 1,755,427 1,497,065    
Retained earnings 646,193 834,521    
Total stockholders’ equity 2,387,504 2,319,342    
Total liabilities and stockholders’ equity 4,685,200 4,780,764    
Combined Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 13,686 8,953 $ 11,508 $ 45,035
Accounts receivable – oil and gas revenues 103,128 96,495    
Accounts receivable – joint interest and other 77,903 100,899    
Accounts receivable – affiliates 347,331 247,488    
Inventory 8,513 11,072    
Prepaid expenses 5,680 7,050    
Derivative instruments 9,142 139,697    
Other current assets 4,290 50    
Total current assets 569,673 611,704    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 6,438,782 6,284,401    
Other property and equipment 580,171 443,265    
Less: accumulated depreciation, depletion, amortization and impairment (1,866,280) (1,509,424)    
Total property, plant and equipment, net 5,152,673 5,218,242    
Assets held for sale   26,728    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 194 15,776    
Deferred income taxes 0 0    
Other assets 22,549 23,243    
Total assets 5,745,089 5,895,693    
Current liabilities        
Accounts payable 7,929 9,983    
Accounts payable – affiliates 1,348 1,248    
Revenues and production taxes payable 141,991 132,356    
Accrued liabilities 98,899 167,659    
Accrued interest payable 33 73    
Derivative instruments 17,308      
Advances from joint interest partners 5,191 4,647    
Other current liabilities 0 6,500    
Total current liabilities 272,699 322,466    
Long-term debt 195,000 138,000    
Deferred income taxes 751,402 813,329    
Asset retirement obligations 37,092 35,338    
Liabilities held for sale   10,228    
Derivative instruments 7,755      
Other liabilities 2,992 3,160    
Total liabilities 1,266,940 1,322,521    
Stockholders’ equity        
Capital contributions from affiliates 3,385,326 3,369,895    
Common stock, $0.01 par value: 450,000,000 shares authorized,181,200,581 shares issued and 180,399,060 shares outstanding at June 30, 2016; 300,000,000 shares authorized,139,583,990 shares issued and 139,076,064 shares outstanding at December 31, 2015 0 0    
Treasury stock, at cost: 801,521 and 507,926 shares at June 30, 2016 and December 31, 2015, respectively 0 0    
Additional paid-in capital 8,743 8,743    
Retained earnings 1,084,080 1,194,534    
Total stockholders’ equity 4,478,149 4,573,172    
Total liabilities and stockholders’ equity $ 5,745,089 $ 5,895,693