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Reclamation (Tables)
 6 Months Ended
Jun. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Asset retirement obligation - Beginning
$
58,460

 
$
35,197

 
$
57,454

 
$
34,457

Accretion
1,435

 
758

 
2,752

 
1,500

Settlements
(100
)
 
(377
)
 
(411
)
 
(379
)
Asset retirement obligation - Ending
$
59,795

 
$
35,578

 
$
59,795

 
$
35,578