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Reclamation (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
 
Nine months ended September 30,
In thousands
2019
 
2018
 
2019
 
2018
Asset retirement obligation - Beginning

$137,545

 

$122,907

 
$
133,508

 
$
118,799

Accretion
3,024

 
2,830

 
8,878

 
8,141

Settlements
(833
)
 
(1,171
)
 
(2,650
)
 
(2,374
)
Asset retirement obligation - Ending

$139,736

 

$124,566

 
$
139,736

 
$
124,566