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Asset Retirement Obligations
9 Months Ended
Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

A reconciliation of the beginning and ending aggregate carrying amounts of the asset retirement obligations for the period from December 31, 2014 to September 30, 2015 is as follows (in thousands):
Asset retirement obligations at December 31, 2014
$
54,402

Liability incurred upon acquiring and drilling wells
967

Liability settled or disposed in current period
(571
)
Accretion
3,323

Asset retirement obligations at September 30, 2015
58,121

Less: current portion

Asset retirement obligations, net of current
$
58,121