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Employee Benefit Plans and Other Postretirement Plans Schedule of Pension Plan Asset Investments and Target Allocations (Details) (USD $) In Thousands, unless otherwise specified														12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Debt Securities	Dec. 31, 2012 Debt Securities	Dec. 31, 2013 International Equity Securities	Dec. 31, 2012 International Equity Securities	Dec. 31, 2013 U.S. Equity Securities	Dec. 31, 2012 U.S. Equity Securities	Dec. 31, 2013 Real Estate Securities	Dec. 31, 2012 Real Estate Securities	Dec. 31, 2013 Other Securities	Dec. 31, 2012 Other Securities	Dec. 31, 2013 Boise Inc.	Dec. 31, 2013 Boise Inc. Debt Securities	Dec. 31, 2013 Boise Inc. Equities	Dec. 31, 2013 Packaging Corporation of America	Dec. 31, 2013 Packaging Corporation of America Debt Securities	Dec. 31, 2013 Packaging Corporation of America Other Securities	Dec. 31, 2013 Packaging Corporation of America Equities
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Percentage of Fair Value			52.00%	61.00%	25.00%	20.00%	21.00%	16.00%	1.00%	3.00%	1.00%	0.00%
Fair value of plan assets	$ 772,082	$ 238,359											$ 489,000			$ 283,100
Target Allocations														50.00%	50.00%		62.00%	4.00%	34.00%

X

- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

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-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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