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Reclamation (Tables)
 9 Months Ended
Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
 
Three months ended September 30,
 
Nine months ended September 30,
In thousands
2015
 
2014
 
2015
 
2014
Asset retirement obligation - Beginning
$
87,601

 
$
59,795

 
$
67,214

 
$
57,454

Accretion
2,038

 
1,452

 
5,652

 
4,205

Additions and changes in estimates
—

 
—

 
18,270

 
—

Settlements
(2,363
)
 
(58
)
 
(3,860
)
 
(470
)
Asset retirement obligation - Ending
$
87,276

 
$
61,189

 
$
87,276

 
$
61,189