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Asset Retirement Obligations (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis      
Balance at December 31, 2013 $ 41,030    
Obligations incurred with development activities 501    
Accretion expense 2,582 3,667  
Revision in estimated cash flows (134)    
Obligations discharged with divestitures of properties and asset retirements (2,984)    
Balance at September 30, 2014 40,995    
Less: Liabilities held for sale (1) (273) [1]    
Less current portion 1,158    
Long-term portion $ 39,564   $ 37,638
[1] Represents asset retirement obligations related to our assets held for sale. See Note 12, Assets Held for Sale, Divestitures and Discontinued Operations, and Note 15, Subsequent Event, for additional information regarding the sale of our interest in PDCM.