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Reclamation (Tables)
 9 Months Ended
Sep. 30, 2018
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
2018
 
2017
 
2018
 
2017
Asset retirement obligation - Beginning

$122,907

 

$90,002

 
$
118,799

 
$
86,754

Accretion
2,830

 
2,167

 
8,141

 
6,347

Additions and changes in estimates
—

 
3,116

 
—

 
3,116

Settlements
(1,171
)
 
(656
)
 
(2,374
)
 
(1,588
)
Asset retirement obligation - Ending

$124,566

 

$94,629

 
$
124,566

 
$
94,629