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Reclamation (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
 
Year ended December 31,
In thousands
2015
 
2014
Asset retirement obligation - Beginning
$
67,214

 
$
55,966

Accretion
7,738

 
4,826

Additions and changes in estimates
11,939

 
6,748

Settlements
(4,819
)
 
(326
)
Asset retirement obligation - Ending
$
82,072

 
$
67,214