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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Changes to Company's Asset Retirement Obligations

The following table describes the changes to the Company’s asset retirement obligations during 2015 and 2014 (in thousands):

 

 

 

2015

 

 

2014

 

Balance at beginning of year

 

$

5,301

 

 

$

4,837

 

Liabilities incurred

 

 

340

 

 

 

473

 

Liabilities settled

 

 

(120

)

 

 

(197

)

Accretion expense

 

 

171

 

 

 

169

 

Revision in estimated costs of plugging oil and natural gas wells

 

 

—

 

 

 

19

 

Asset retirement obligation at end of year

 

$

5,692

 

 

$

5,301