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Decommissioning and Other Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Decommissioning and Other Asset Retirement Obligations Detail [Table]      
Beginning balance for the period, as reported $ 55,023 $ 57,449  
Activity in the period:      
Accretion of liability 632 1,438  
Retirement obligations incurred 0 0  
Revisions in estimated cash flows 7 220  
Settlement of retirement obligations (324) (3,769)  
Ending balance as of June 30 55,338 55,338  
Value of asset retirement obligations associated with non-operated properties $ 9,700 $ 9,700 $ 9,100