Acquisitions (Narrative) (Details) (USD $)	6 Months Ended			6 Months Ended	12 Months Ended				0 Months Ended	6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013	Jun. 30, 2014 Boise Inc.	Dec. 31, 2013 Boise Inc.	Oct. 25, 2013 Boise Inc.	Jun. 30, 2014 Packaging	Dec. 31, 2013 Packaging	Apr. 28, 2014 Packaging Crockett Packaging	Jun. 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	537,363,000		526,789,000				483,400,000	472,900,000		9,400,000
Intangible assets acquired										6,700,000
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	$ 1,170,000	[1]		$ 1,100,000

[1] Adjustments relate primarily to the Boise acquisition, see Note 3, Acquisitions, for more information.