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Reclamation and Mine Closure (Tables)
 12 Months Ended
Dec. 31, 2013
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,
 
2013
 
2012
Asset retirement obligation - Beginning
$
34,457

 
$
32,714

Accretion
3,442

 
2,911

Additions and changes in estimates
20,236

 
(1,073
)
Settlements
(681
)
 
(95
)
Asset retirement obligation - Ending
$
57,454

 
$
34,457