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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Current assets        
Cash and cash equivalents $ 11,440 $ 11,226 $ 6,475 $ 9,730
Accounts receivable, net 218,302 204,335    
Accounts receivable - affiliates 0 0    
Inventory 17,942 10,648    
Prepaid expenses 10,610 7,623    
Derivative instruments 31,851 362    
Other current assets 62 4,355    
Total current assets 290,207 238,549    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 7,488,075 7,296,568    
Other property and equipment 695,592 618,790    
Less: accumulated depreciation, depletion, amortization and impairment (2,252,653) (1,995,791)    
Total property, plant and equipment, net 5,931,014 5,919,567    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 11,834 0    
Deferred income taxes 0 0    
Long-term inventory 8,762 0    
Other assets 19,904 20,516    
Total assets 6,261,721 6,178,632    
Current liabilities        
Accounts payable 12,257 4,645    
Accounts payable - affiliates 0 0    
Revenues and production taxes payable 143,715 139,737    
Accrued liabilities 139,766 119,173    
Accrued interest payable 39,128 39,004    
Derivative instruments 0 60,469    
Advances from joint interest partners 5,816 7,597    
Other current liabilities 0 10,490    
Total current liabilities 340,682 381,115    
Long-term debt 2,359,683 2,297,214    
Deferred income taxes 527,181 513,529    
Asset retirement obligations 51,059 48,985    
Derivative instruments 0 11,714    
Other liabilities 5,506 2,918    
Total liabilities 3,284,111 3,255,475    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,642,598 shares issued and 237,410,395 shares outstanding at June 30, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 2,345 2,331    
Treasury stock, at cost: 1,232,203 and 856,892 shares at June 30, 2017 and December 31, 2016, respectively (21,401) (15,950)    
Additional paid-in capital 2,362,084 2,345,271    
Retained earnings 634,582 591,505    
Total stockholders’ equity 2,977,610 2,923,157    
Total liabilities and stockholders’ equity 6,261,721 6,178,632    
Intercompany Eliminations [Member]        
Current assets        
Cash and cash equivalents 0 0 0 0
Accounts receivable, net 0 0    
Accounts receivable - affiliates (221,205) (279,619)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments 0 0    
Other current assets 0 0    
Total current assets (221,205) (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    
Investments in and advances to subsidiaries (4,545,805) (4,451,192)    
Derivative instruments 0 0    
Deferred income taxes (257,652) (220,058)    
Long-term inventory 0      
Other assets 0 0    
Total assets (5,024,662) (4,950,869)    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates (221,205) (279,619)    
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    
Total current liabilities (221,205) (279,619)    
Long-term debt 0 0    
Deferred income taxes (257,652) (220,058)    
Asset retirement obligations 0 0    
Derivative instruments   0    
Other liabilities 0 0    
Total liabilities (478,857) (499,677)    
Stockholders’ equity        
Capital contributions from affiliates (3,395,528) (3,388,893)    
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,642,598 shares issued and 237,410,395 shares outstanding at June 30, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 0 0    
Treasury stock, at cost: 1,232,203 and 856,892 shares at June 30, 2017 and December 31, 2016, respectively 0 0    
Additional paid-in capital (8,743) (8,743)    
Retained earnings (1,141,534) (1,053,556)    
Total stockholders’ equity (4,545,805) (4,451,192)    
Total liabilities and stockholders’ equity (5,024,662) (4,950,869)    
Parent/Issuer [Member]        
Current assets        
Cash and cash equivalents 178 166 85 777
Accounts receivable, net 0 0    
Accounts receivable - affiliates 187,496 252,000    
Inventory 0 0    
Prepaid expenses 664 275    
Derivative instruments 0 0    
Other current assets 3 0    
Total current assets 188,341 252,441    
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    
Investments in and advances to subsidiaries 4,545,805 4,451,192    
Derivative instruments 0 0    
Deferred income taxes 257,652 220,058    
Long-term inventory 0      
Other assets 0 0    
Total assets 4,991,798 4,923,691    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates 33,709 27,619    
Revenues and production taxes payable 0 0    
Accrued liabilities 0 12    
Accrued interest payable 38,796 38,689    
Derivative instruments   0    
Advances from joint interest partners 0 0    
Other current liabilities   0    
Total current liabilities 72,505 66,320    
Long-term debt 1,941,683 1,934,214    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Derivative instruments   0    
Other liabilities 0 0    
Total liabilities 2,014,188 2,000,534    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,642,598 shares issued and 237,410,395 shares outstanding at June 30, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 2,345 2,331    
Treasury stock, at cost: 1,232,203 and 856,892 shares at June 30, 2017 and December 31, 2016, respectively (21,401) (15,950)    
Additional paid-in capital 2,362,084 2,345,271    
Retained earnings 634,582 591,505    
Total stockholders’ equity 2,977,610 2,923,157    
Total liabilities and stockholders’ equity 4,991,798 4,923,691    
Combined Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 11,262 11,060 $ 6,390 $ 8,953
Accounts receivable, net 218,302 204,335    
Accounts receivable - affiliates 33,709 27,619    
Inventory 17,942 10,648    
Prepaid expenses 9,946 7,348    
Derivative instruments 31,851 362    
Other current assets 59 4,355    
Total current assets 323,071 265,727    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 7,488,075 7,296,568    
Other property and equipment 695,592 618,790    
Less: accumulated depreciation, depletion, amortization and impairment (2,252,653) (1,995,791)    
Total property, plant and equipment, net 5,931,014 5,919,567    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 11,834 0    
Deferred income taxes 0 0    
Long-term inventory 8,762      
Other assets 19,904 20,516    
Total assets 6,294,585 6,205,810    
Current liabilities        
Accounts payable 12,257 4,645    
Accounts payable - affiliates 187,496 252,000    
Revenues and production taxes payable 143,715 139,737    
Accrued liabilities 139,766 119,161    
Accrued interest payable 332 315    
Derivative instruments   60,469    
Advances from joint interest partners 5,816 7,597    
Other current liabilities   10,490    
Total current liabilities 489,382 594,414    
Long-term debt 418,000 363,000    
Deferred income taxes 784,833 733,587    
Asset retirement obligations 51,059 48,985    
Derivative instruments   11,714    
Other liabilities 5,506 2,918    
Total liabilities 1,748,780 1,754,618    
Stockholders’ equity        
Capital contributions from affiliates 3,395,528 3,388,893    
Common stock, $0.01 par value: 450,000,000 shares authorized; 238,642,598 shares issued and 237,410,395 shares outstanding at June 30, 2017 and 237,201,064 shares issued and 236,344,172 shares outstanding at December 31, 2016 0 0    
Treasury stock, at cost: 1,232,203 and 856,892 shares at June 30, 2017 and December 31, 2016, respectively 0 0    
Additional paid-in capital 8,743 8,743    
Retained earnings 1,141,534 1,053,556    
Total stockholders’ equity 4,545,805 4,451,192    
Total liabilities and stockholders’ equity $ 6,294,585 $ 6,205,810