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Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligation
A reconciliation of the beginning and ending aggregate carrying amounts of the asset retirement obligations for the period from December 31, 2015 to March 31, 2016 is as follows (in thousands):
Asset retirement obligations at December 31, 2015
$
103,578

Liability incurred upon acquiring and drilling wells
153

Liability settled or disposed in current period(1)
(34,600
)
Accretion
1,588

Asset retirement obligations at March 31, 2016
70,719

Less: current portion
8,440

Asset retirement obligations, net of current
$
62,279


____________________
(1)
Includes $34.1 million associated with the divestiture of the Company’s oil and natural gas properties located in the Piñon field in the WTO, as discussed in Note 3.