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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Changes to Asset Retirement Obligations

The changes to the asset retirement obligations during 2016 and 2015 are as follows (in thousands):

 

 

 

2016

 

 

2015

 

Balance at beginning of year

 

$

5,692

 

 

$

5,301

 

Liabilities incurred

 

 

164

 

 

 

340

 

Liabilities settled

 

 

(124

)

 

 

(120

)

Accretion expense

 

 

166

 

 

 

171

 

Revision in estimated costs of plugging oil and natural gas wells

 

 

42

 

 

 

—

 

Asset retirement obligation at end of year

 

$

5,940

 

 

$

5,692