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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Reconciliation
The following table presents a reconciliation of the Company’s asset retirement obligations:
 
December 31,
 
2015
 
2014
 
(in thousands)
 
 
 
 
Asset retirement obligations at beginning of year
$
497,570

 
$
289,321

Liabilities added from acquisitions
—

 
176,538

Liabilities added from drilling
3,574

 
10,476

Liabilities associated with assets divested
(3,306
)
 
(25,656
)
Current year accretion expense
30,016

 
22,164

Settlements
(6,336
)
 
(12,620
)
Revision of estimates
2,023

 
37,347

Asset retirement obligations at end of year
$
523,541

 
$
497,570