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Reclamation (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
In thousands
2016
 
2015
 
2016
 
2015
Asset retirement obligation - Beginning
$
83,974

 
$
86,059

 
$
82,072

 
$
67,214

Accretion
2,009

 
1,990

 
3,968

 
3,614

Additions and changes in estimates
(130
)
 
—

 
121

 
18,270

Settlements
(308
)
 
(448
)
 
(616
)
 
(1,497
)
Asset retirement obligation - Ending
$
85,545

 
$
87,601

 
$
85,545

 
$
87,601