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Reclamation (Tables)
 3 Months Ended
Mar. 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:
 
Three Months Ended March 31,
In thousands
2019
 
2018
Asset retirement obligation - Beginning
$
133,508

 
$
118,799

Accretion
2,895

 
2,545

Settlements
(662
)
 
(496
)
Asset retirement obligation - Ending
$
135,741

 
$
120,848