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Reclamation (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations (included in Reclamation) are as follows: 
In thousands
Year ended December 31,
 
2014
 
2013
Asset retirement obligation - Beginning
$
55,966

 
$
33,008

Accretion
4,826

 
3,316

Additions and changes in estimates
6,748

 
19,670

Settlements
(326
)
 
(28
)
Asset retirement obligation - Ending
$
67,214

 
$
55,966