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Reclamation (Tables)
 9 Months Ended
Sep. 30, 2017
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 September 30,
 
Nine months ended September 30,
In thousands
2017
 
2016
 
2017
 
2016
Asset retirement obligation - Beginning
$
101,127

 
$
85,545

 
$
97,380

 
$
82,072

Accretion
2,455

 
2,059

 
7,190

 
6,027

Additions and changes in estimates
3,116

 
(239
)
 
3,116

 
(118
)
Settlements
(656
)
 
(183
)
 
(1,644
)
 
(799
)
Asset retirement obligation - Ending
$
106,042


$
87,182

 
$
106,042

 
$
87,182