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Reclamation (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations for operating sites are as follows:
 
Year ended December 31,
In thousands
2016
 
2015
Asset retirement obligation - Beginning
$
82,072

 
$
67,214

Accretion
8,136

 
7,738

Additions and changes in estimates
8,688

 
11,939

Settlements
(1,516
)
 
(4,819
)
Asset retirement obligation - Ending
$
97,380


$
82,072