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Reclamation (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
In thousands
2016
 
2015
Asset retirement obligation - Beginning
$
82,072

 
$
67,214

Accretion
1,960

 
1,412

Additions and changes in estimates
251

 
18,292

Settlements
(309
)
 
(859
)
Asset retirement obligation - Ending
$
83,974

 
$
86,059