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Retirement Plans and Other Post-Retirement Benefits (Details 10) | 12 Months Ended
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Dec. 31, 2012
Large cap [Member] |
Schedule of target allocation for the plan assets |
Target allocation for the plan assets | 39.00%
Small and mid cap [Member] |
Schedule of target allocation for the plan assets |
Target allocation for the plan assets | 13.00%
International equity [Member] |
Schedule of target allocation for the plan assets |
Target allocation for the plan assets | 13.00%
Real Estate Investment Trusts (REIT) [Member] |
Schedule of target allocation for the plan assets |
Target allocation for the plan assets | 5.00%
Fixed income, cash and cash equivalents [Member] |
Schedule of target allocation for the plan assets |
Target allocation for the plan assets | 30.00%

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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=21915506&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=21915506&loc=d3e2446-114920 + Details
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