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Reclamation and Mine Closure (Tables)
 3 Months Ended
Mar. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations are as follows (in thousands): 
 
Three months ended
March 31,
 
2013
 
2012
Asset retirement obligation - Beginning
$
33,434

 
$
32,714

Accretion
743

 
724

Addition and changes in estimates
—

 
—

Settlements
(2
)
 
(4
)
Asset retirement obligation - March 31
$
34,175

 
$
33,434