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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Disclosure of Cash Flow Information      
Cash paid for interest, net of amounts capitalized $ 257,152 $ 224,127 $ 210,112
Cash paid (received) for income taxes 1,324 2,083 (1,508)
Supplemental Disclosure of Noncash Investing and Financing Activities      
Deposit on pending sale 255,000 0 0
Change in accrued capital expenditures 27,610 89,388 85,282
Adjustment to oil and natural gas properties for estimated contract loss 50,000 25,000 105,000
Asset retirement costs capitalized 7,479 5,716 17,347
Common stock issued in connection with acquisition 542,138 0 1,246,334
Stock issued to satisfy settlement $ 0 $ 0 $ 12,200