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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
 
 
December 31,
(In thousands)
 
2017
 
2016
Pulp, paperboard and tissue products
 
$
165,281

 
$
154,460

Materials and supplies
 
85,987

 
82,005

Logs, pulpwood, chips and sawdust
 
14,775

 
21,564

 
 
$
266,043

 
$
258,029