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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Asset Retirement Obligation Transactions

The following table summarizes the Company’s asset retirement obligation transactions recorded during the six months ended September 30, 2016 (in thousands):

 

 

 

2016

 

At December 31, 2015

 

$

5,075

 

Liabilities incurred

 

 

114

 

Liabilities settled

 

 

(15

)

Accretion expense

 

 

404

 

Acquisitions

 

 

250

 

Revision of estimates

 

 

(13

)

At September 30, 2016

 

$

5,815