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Supplemental Disclosures to the Condensed Balance Sheets and Condensed Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Accrued Liabilities [Abstract]      
Accrued interest $ 19,138   $ 18,926
Accrued compensation 6,340   6,749
Asset retirement obligations (current portion) 3,318   3,318
Other 91   0
Other accrued liabilities 28,887   28,993
Supplemental Cash Flow Information [Abstract]      
Cash payments for interest, net of amounts capitalized 27,163 20,629  
Cash payments for income taxes 0 0  
Noncash investing activities [Abstract]      
Accrued capital expenditures 7,540 32,379  
Asset retirement obligations $ 1,412 $ 7,022