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Decommissioning and Other Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Decommissioning and Other Asset Retirement Obligations Detail [Table]    
Beginning balance for the period, as reported $ 57,449  
Activity in the period:    
Accretion of liability 402  
Retirement obligations incurred 0  
Revisions in estimated cash flows 121  
Settlement of retirement obligations (3,381)  
Ending balance as of June 30 54,591  
Value of asset retirement obligations associated with non-operated properties $ 9,300 $ 9,100