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Reclamation (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
In thousands
2017
 
2016
Asset retirement obligation - Beginning
$
97,380

 
$
82,072

Accretion
2,338

 
1,960

Additions and changes in estimates
—

 
251

Settlements
(478
)
 
(309
)
Asset retirement obligation - Ending
$
99,240


$
83,974