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Reclamation (Tables)
 3 Months Ended
Mar. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations for its operating sites are as follows:
 
Three Months Ended March 31,
In thousands
2020
 
2019
Asset retirement obligation - Beginning
$
134,543

 
$
133,508

Accretion
2,804

 
2,895

Settlements
(719
)
 
(662
)
Asset retirement obligation - Ending
$
136,628

 
$
135,741