Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Details)

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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Asset Retirement Obligations        
Asset retirement obligations - beginning of period     $ 16,614  
Obligations incurred for wells drilled     2,564  
Accretion expense $ 419 $ 320 1,227 $ 931
Asset retirement obligations - end of period $ 20,405   $ 20,405