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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014 and 2013 (in thousands). 
 
 
Year Ended December 31,
 
 
2014
 
2013
Beginning asset retirement obligations
 
$
7,484

 
$
5,769

Liabilities incurred during period
 
2,322

 
936

Liabilities settled during period
 
(22
)
 
(103
)
Revisions in estimated cash flows
 
1,663

 
534

Accretion expense
 
504

 
348

Ending asset retirement obligations
 
11,951

 
7,484

Less: current asset retirement obligations (1)
 
(311
)
 
(175
)
Long-term asset retirement obligations
 
$
11,640

 
$
7,309