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Reclamation and Mine Closure (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six months ended
June 30,
 
2012
 
2011
 
2012
 
2011
Asset retirement obligation - Beginning
$
33,434

 
$
27,908

 
$
32,714

 
$
27,302

Accretion
742

 
654

 
1,466

 
1,290

Addition and changes in estimates
335

 
—

 
335

 
—

Settlements
(1
)
 
(5
)
 
(5
)
 
(35
)
Asset retirement obligation - June 30
$
34,510

 
$
28,557

 
$
34,510

 
$
28,557