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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Current assets        
Cash and cash equivalents $ 6,475 $ 9,730 $ 13,684 $ 45,811
Accounts receivable – oil and gas revenues 109,121 96,495    
Accounts receivable – joint interest and other 81,291 100,914    
Accounts receivable – affiliates 0 0    
Inventory 9,018 11,072    
Prepaid expenses 5,838 7,328    
Derivative instruments 10,330 139,697    
Other current assets 4,164 50    
Total current assets 226,237 365,286    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 6,402,648 6,284,401    
Other property and equipment 536,462 443,265    
Less: accumulated depreciation, depletion, amortization and impairment (1,752,376) (1,509,424)    
Total property, plant and equipment, net 5,186,734 5,218,242    
Assets held for sale 0 26,728    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 64 15,776    
Deferred income taxes 0 0    
Other assets 22,504 23,343    
Total assets 5,435,539 5,649,375    
Current liabilities        
Accounts payable 10,357 9,983    
Accounts payable – affiliates 0 0    
Revenues and production taxes payable 138,451 132,356    
Accrued liabilities 128,284 167,669    
Accrued interest payable 47,671 49,413    
Derivative instruments 20,891 0    
Advances from joint interest partners 5,416 4,647    
Other current liabilities 15,001 6,500    
Total current liabilities 366,071 370,568    
Long-term debt 2,127,361 2,302,584    
Deferred income taxes 528,028 608,155    
Asset retirement obligations 36,390 35,338    
Liabilities held for sale 0 10,228    
Derivative instruments 14,291 0    
Other liabilities 3,043 3,160    
Total liabilities 3,075,184 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 1,777 1,376    
Treasury stock, at cost: 801,521 and 507,926 shares at June 30, 2016 and December 31, 2015, respectively (15,140) (13,620)    
Additional paid-in capital 1,693,583 1,497,065    
Retained earnings 680,135 834,521    
Total stockholders’ equity 2,360,355 2,319,342    
Total liabilities and stockholders’ equity 5,435,539 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 (200,050) (248,736)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments 0 0    
Other current assets 0 0    
Total current assets (200,050) (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 (4,474,390) (4,573,172)    
Derivative instruments 0 0    
Deferred income taxes (223,269) (205,174)    
Other assets 0 0    
Total assets (4,897,709) (5,027,082)    
Current liabilities        
Accounts payable 0 0    
Accounts payable – affiliates (200,050) (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 (200,050) (248,736)    
Long-term debt 0 0    
Deferred income taxes (223,269) (205,174)    
Asset retirement obligations 0 0    
Liabilities held for sale   0    
Derivative instruments 0      
Other liabilities 0 0    
Total liabilities (423,319) (453,910)    
Stockholders’ equity        
Capital contributions from affiliates (3,380,427) (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 (1,085,220) (1,194,534)    
Total stockholders’ equity (4,474,390) (4,573,172)    
Total liabilities and stockholders’ equity (4,897,709) (5,027,082)    
Parent/Issuer [Member]        
Current assets        
Cash and cash equivalents 85 777 778 776
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 0 278    
Derivative instruments 0 0    
Other current assets 0 0    
Total current assets 1,433 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 4,474,390 4,573,172    
Derivative instruments 0 0    
Deferred income taxes 223,269 205,174    
Other assets 0 100    
Total assets 4,699,092 4,780,764    
Current liabilities        
Accounts payable 0 0    
Accounts payable – affiliates 198,702 247,488    
Revenues and production taxes payable 0 0    
Accrued liabilities 31 10    
Accrued interest payable 47,643 49,340    
Derivative instruments 0      
Advances from joint interest partners 0 0    
Other current liabilities 0 0    
Total current liabilities 246,376 296,838    
Long-term debt 2,092,361 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 2,338,737 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 1,777 1,376    
Treasury stock, at cost: 801,521 and 507,926 shares at June 30, 2016 and December 31, 2015, respectively (15,140) (13,620)    
Additional paid-in capital 1,693,583 1,497,065    
Retained earnings 680,135 834,521    
Total stockholders’ equity 2,360,355 2,319,342    
Total liabilities and stockholders’ equity 4,699,092 4,780,764    
Combined Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 6,390 8,953 $ 12,906 $ 45,035
Accounts receivable – oil and gas revenues 109,121 96,495    
Accounts receivable – joint interest and other 81,291 100,899    
Accounts receivable – affiliates 198,702 247,488    
Inventory 9,018 11,072    
Prepaid expenses 5,838 7,050    
Derivative instruments 10,330 139,697    
Other current assets 4,164 50    
Total current assets 424,854 611,704    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 6,402,648 6,284,401    
Other property and equipment 536,462 443,265    
Less: accumulated depreciation, depletion, amortization and impairment (1,752,376) (1,509,424)    
Total property, plant and equipment, net 5,186,734 5,218,242    
Assets held for sale   26,728    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 64 15,776    
Deferred income taxes 0 0    
Other assets 22,504 23,243    
Total assets 5,634,156 5,895,693    
Current liabilities        
Accounts payable 10,357 9,983    
Accounts payable – affiliates 1,348 1,248    
Revenues and production taxes payable 138,451 132,356    
Accrued liabilities 128,253 167,659    
Accrued interest payable 28 73    
Derivative instruments 20,891      
Advances from joint interest partners 5,416 4,647    
Other current liabilities 15,001 6,500    
Total current liabilities 319,745 322,466    
Long-term debt 35,000 138,000    
Deferred income taxes 751,297 813,329    
Asset retirement obligations 36,390 35,338    
Liabilities held for sale   10,228    
Derivative instruments 14,291      
Other liabilities 3,043 3,160    
Total liabilities 1,159,766 1,322,521    
Stockholders’ equity        
Capital contributions from affiliates 3,380,427 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 1,085,220 1,194,534    
Total stockholders’ equity 4,474,390 4,573,172    
Total liabilities and stockholders’ equity $ 5,634,156 $ 5,895,693