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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in Company's asset retirement obligations
The following table summarizes the changes in the Company’s asset retirement obligations for the years ended December 31, 2015 and 2014 (in thousands). 
 
 
Year Ended December 31,
 
 
2015
 
2014
Beginning asset retirement obligations
 
$
11,951

 
$
7,484

Liabilities incurred during period
 
4,508

 
2,322

Liabilities settled during period
 
(588
)
 
(22
)
Revisions in estimated cash flows
 
(1,185
)
 
1,663

Accretion expense
 
734

 
504

Ending asset retirement obligations
 
15,420

 
11,951

Less: current asset retirement obligations (1)
 
(254
)
 
(311
)
Long-term asset retirement obligations
 
$
15,166

 
$
11,640


__________________
(1)
Included in accrued liabilities in the Company’s consolidated balance sheets at December 31, 2015 and 2014.