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Reclamation and Mine Closure (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations are as follows (in thousands): 
 
Years ended December 31,
 
2012
 
2011
Asset retirement obligation - Beginning
$
32,714

 
$
27,302

Accretion
2,911

 
2,648

Addition and changes in estimates
(1,073
)
 
2,822

Settlements
(95
)
 
(58
)
Asset retirement obligation - December 31
$
34,457

 
$
32,714