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Reclamation (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
In thousands
2018
 
2017
 
2018
 
2017
Asset retirement obligation - Beginning

$120,848

 

$88,397

 
$
118,799

 
$
86,754

Accretion
2,766

 
2,116

 
5,311

 
4,180

Settlements
(707
)
 
(511
)
 
(1,203
)
 
(932
)
Asset retirement obligation - Ending

$122,907

 

$90,002

 
$
122,907

 
$
90,002