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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Disclosure of Cash Flow Information      
Cash paid for interest, net of amounts capitalized $ (274,850) $ (257,152) $ (224,127)
Cash paid for income taxes (4,610) (1,324) (2,083)
Supplemental Disclosure of Noncash Investing and Financing Activities      
Deposit on pending sale (255,000) 255,000 0
Change in accrued capital expenditures 72,848 (27,610) (89,388)
Adjustment to oil and natural gas properties for contract loss 0 50,000 25,000
Asset retirement costs capitalized 5,078 7,479 5,716
Common stock issued in connection with acquisition $ 0 $ 542,138 $ 0