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Reclamation (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
In thousands
2019
 
2018
 
2019
 
2018
Asset retirement obligation - Beginning

$135,741

 

$120,848

 
$
133,508

 
$
118,799

Accretion
2,959

 
2,766

 
5,854

 
5,311

Settlements
(1,155
)
 
(707
)
 
(1,817
)
 
(1,203
)
Asset retirement obligation - Ending

$137,545

 

$122,907

 
$
137,545

 
$
122,907