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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Asset Retirement Obligation, Roll Forward Analysis    
Asset retirement obligations at December 31, 2015 $ 103,578  
Liability incurred upon acquiring and drilling wells 153  
Liability settled or disposed in current period (34,600)  
Accretion 1,588  
Asset retirement obligations at March 31, 2016 70,719  
Less: current portion 8,440 $ 8,399
Asset retirement obligations 62,279 $ 95,179
WTO Properties    
Asset Retirement Obligation, Roll Forward Analysis    
Liability settled or disposed in current period $ (34,100)