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Reclamation (Tables)
 12 Months Ended
Dec. 31, 2017
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
2017
 
2016
Asset retirement obligation - Beginning
$
86,754

 
$
71,763

Accretion
8,769

 
7,030

Additions and changes in estimates
25,370

 
9,389

Settlements
(2,094
)
 
(1,428
)
Asset retirement obligation - Ending
$
118,799

 
$
86,754