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Reclamation (Tables)
 9 Months Ended
Sep. 30, 2016
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
2016
 
2015
 
2016
 
2015
Asset retirement obligation - Beginning
$
85,545

 
$
87,601

 
$
82,072

 
$
67,214

Accretion
2,059

 
2,038

 
6,027

 
5,652

Additions and changes in estimates
(239
)
 
—

 
(118
)
 
18,270

Settlements
(183
)
 
(2,363
)
 
(799
)
 
(3,860
)
Asset retirement obligation - Ending
$
87,182

 
$
87,276

 
$
87,182

 
$
87,276