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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in the carrying amounts of the ARO
The changes in the carrying amount of the ARO during the three months ended March 31, 2013, and March 31, 2012, are as follows:
 
For the three months ended
 
March 31,
 
2013
 
2012
Beginning balance
$
34,113

 
$
33,880

Accretion expense
634

 
703

Additions and changes in estimates
—

 
—

Cost of reclamation work performed
(883
)
 
(2,575
)
Balance at the end of the period
$
33,864

 
$
32,008

 
 
 
 
Current portion
$
9,096

 
$
8,626

Long term portion
$
24,768

 
$
23,382