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Asset Retirement Obligations
6 Months Ended
Jun. 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 June 30, 2015 is as follows (in thousands):
Asset retirement obligations at December 31, 2014
$
54,402

Liability incurred upon acquiring and drilling wells
860

Liability settled or disposed in current period
(369
)
Accretion
2,191

Asset retirement obligations at June 30, 2015
57,084

Less: current portion

Asset retirement obligations, net of current
$
57,084