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Reclamation (Tables)
 3 Months Ended
Mar. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
 
Three months ended March 31,
In thousands
2015
 
2014
Asset retirement obligation - Beginning
$
67,214

 
$
57,454

Accretion
1,412

 
1,317

Additions and changes in estimates
18,292

 
—

Settlements
(859
)
 
(311
)
Asset retirement obligation - Ending
$
86,059

 
$
58,460