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Reclamation (Tables)
 12 Months Ended
Dec. 31, 2019
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
2019
 
2018
Asset retirement obligation - Beginning
$
133,508

 
$
118,799

Accretion
11,968

 
11,037

Additions and changes in estimates
(7,538
)
 
6,880

Settlements
(3,540
)
 
(3,208
)
Asset retirement obligation - Ending
$
134,398

 
$
133,508