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Boise Acquisition (Narrative) (Details) (Boise Inc., USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Oct. 25, 2013
Boise Inc.
   
Business Acquisition [Line Items]    
Outstanding stock and voting equity interests acquired   100.00%
Business acquisition, cost of acquired entity $ 2,100.0