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Asset Retirement Obligation (Tables)
 3 Months Ended
Mar. 31, 2016
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 the three months ended March 31, 2016 and 2015 (in thousands):

 

 

Three Months Ended

 

 

March 31,

 

 

2016

 

 

2015

 

Balance at beginning of year

$

5,692

 

 

$

5,301

 

Liabilities incurred

 

67

 

 

 

188

 

Liabilities settled

 

(49

)

 

 

(25

)

Accretion expense

 

42

 

 

 

42

 

Revision in estimated costs of plugging oil and natural gas wells

 

—

 

 

 

—

 

Asset retirement obligation at end of period

$

5,752

 

 

$

5,506