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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 (in thousands). 
 
 
Year Ended December 31,
 
 
2016
 
2015
Beginning asset retirement obligations
 
$
15,420

 
$
11,951

Liabilities incurred during period
 
1,791

 
4,508

Liabilities settled during period
 
(375
)
 
(588
)
Revisions in estimated cash flows
 
2,622

 
(1,185
)
Accretion expense
 
1,182

 
734

Ending asset retirement obligations
 
20,640

 
15,420

Less: current asset retirement obligations (1)
 
(915
)
 
(254
)
Long-term asset retirement obligations
 
$
19,725

 
$
15,166


__________________
(1)
Included in accrued liabilities in the Company’s consolidated balance sheets at December 31, 2016 and 2015.