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Reclamation (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six months ended June 30,
In thousands
2017
 
2016
 
2017
 
2016
Asset retirement obligation - Beginning
$
99,240

 
$
83,974

 
$
97,380

 
$
82,072

Accretion
2,397

 
2,009

 
4,735

 
3,968

Additions and changes in estimates
—

 
(130
)
 
—

 
121

Settlements
(510
)
 
(308
)
 
(988
)
 
(616
)
Asset retirement obligation - Ending
$
101,127


$
85,545

 
$
101,127

 
$
85,545