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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013 and 2012 (in thousands). 
 
 
Year Ended December 31,
 
 
2013
 
2012
Beginning asset retirement obligations
 
$
5,769

 
$
4,270

Liabilities incurred during period
 
936

 
1,243

Liabilities settled during period
 
(103
)
 
—

Revisions in estimated cash flows
 
534

 
—

Accretion expense
 
348

 
256

Ending asset retirement obligations
 
7,484

 
5,769

Less: current asset retirement obligations (1)
 
(175
)
 
(660
)
Long-term asset retirement obligations
 
$
7,309

 
$
5,109