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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
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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%

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- 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 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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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 + Details
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