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Reclamation (Tables)
 6 Months Ended
Jun. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
 
Three months ended June 30,
 
Six months ended June 30,
In thousands
2015
 
2014
 
2015
 
2014
Asset retirement obligation - Beginning
$
86,059

 
$
58,460

 
$
67,214

 
$
57,454

Accretion
1,990

 
1,435

 
3,614

 
2,752

Additions and changes in estimates
—

 
—

 
18,270

 
—

Settlements
(448
)
 
(100
)
 
(1,497
)
 
(411
)
Asset retirement obligation - Ending
$
87,601

 
$
59,795

 
$
87,601

 
$
59,795