Goodwill and Intangible Assets Goodwill (Details) (USD $)	9 Months Ended						0 Months Ended	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2014 Packaging	Dec. 31, 2013 Packaging	Sep. 30, 2014 Paper	Dec. 31, 2013 Paper	Apr. 28, 2014 Crockett Packaging Packaging	Sep. 30, 2014 Crockett Packaging Packaging
Goodwill [Line Items]
Goodwill	$ 541,911,000		$ 487,900,000	$ 472,900,000	$ 54,000,000	$ 53,900,000		$ 10,700,000
Business acquisition, cost of acquired entity							21,200,000
Working capital adjustments								(900,000)
Goodwill [Roll Forward]
Balance at December 31, 2013	526,789,000		487,900,000	472,900,000	54,000,000	53,900,000
Acquisitions	10,734,000	[1]
Adjustments related to purchase accounting	4,388,000	[2]
Balance at September 30, 2014	$ 541,911,000		$ 487,900,000	$ 472,900,000	$ 54,000,000	$ 53,900,000		$ 10,700,000

[1] In April 2014, we acquired the assets of Crockett Packaging, a corrugated products manufacturer, for $21.2 million, before $0.9 million of working capital adjustments, and recorded $10.7 million of goodwill in our Packaging segment.

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