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Reclamation and Mine Closure (Tables)
 3 Months Ended
Mar. 31, 2012
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,
 
2012
 
2011
Asset retirement obligation - Beginning
$
32,714

 
$
27,302

Accretion
724

 
637

Addition and changes in estimates
—

 
—

Settlements
(4
)
 
(31
)
Asset retirement obligation - March 31
$
33,434

 
$
27,908