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Acquisitions (Narrative) (Details) (USD $)
 9 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Boise Inc.
Dec. 31, 2013
Boise Inc.
Oct. 25, 2013
Boise Inc.
Sep. 30, 2014
Packaging
Dec. 31, 2013
Packaging
Apr. 28, 2014
Packaging
Crockett Packaging
Sep. 30, 2014
Packaging
Crockett Packaging
Business Acquisition [Line Items]                  
Business acquisition, cost of acquired entity       $ 2,100,000,000       $ 21,200,000  
Working capital adjustments                 (900,000)
Goodwill 541,911,000 526,789,000       487,900,000 472,900,000   10,700,000
Intangible assets acquired                 5,500,000
Acquired finite-lived intangible assets, weighted average useful life                 10 years
Outstanding stock and voting equity interests acquired         100.00%        
Adjustments related to purchase accounting $ 4,388,000 [1]   $ 4,300,000            
[1] Adjustments relate primarily to the Boise acquisition, see Note 3, Acquisitions, for more information.