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Reclamation and Mine Closure (Tables)
 9 Months Ended
Sep. 30, 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
September 30,
 
Nine months ended
September 30,
 
2012
 
2011
 
2012
 
2011
Asset retirement obligation - Beginning
$
34,510

 
$
28,557

 
$
32,714

 
$
27,302

Accretion
714

 
670

 
2,180

 
1,961

Addition and changes in estimates
—

 
—

 
335

 
—

Settlements
(13
)
 
(15
)
 
(18
)
 
(51
)
Asset retirement obligation - September 30
$
35,211

 
$
29,212

 
$
35,211

 
$
29,212