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Reclamation (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations for its operating sites are as follows:
 
Year ended December 31,
In thousands
2018
 
2017
Asset retirement obligation - Beginning
$
118,799

 
$
86,754

Accretion
11,037

 
8,769

Additions and changes in estimates
6,880

 
25,370

Settlements
(3,208
)
 
(2,094
)
Asset retirement obligation - Ending
$
133,508

 
$
118,799