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Supplemental Disclosures to the Condensed Balance Sheets and Condensed Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Accrued Liabilities [Abstract]      
Accrued interest $ 16,232   $ 18,926
Accrued compensation 0   6,749
Asset retirement obligations (current portion) 3,318   3,318
Other 10   0
Other accrued liabilities 19,560   28,993
Supplemental Cash Flow Information [Abstract]      
Cash payments for interest, net of amounts capitalized 55,751 43,197  
Cash payments for income taxes 0 600  
Noncash investing activities [Abstract]      
Accrued capital expenditures 38,969 40,607  
Asset retirement obligations $ 2,842 $ 10,607