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Reclamation (Tables)
 3 Months Ended
Mar. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations for operating sites are as follows:
 
Three months ended March 31,
In thousands
2018
 
2017
Asset retirement obligation - Beginning
$
118,799

 
$
86,754

Accretion
2,545

 
2,064

Settlements
(496
)
 
(421
)
Asset retirement obligation - Ending
$
120,848

 
$
88,397