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Pension Plans (Details 8) | 12 Months Ended
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Dec. 31, 2012
Equities [Member] |
Weighted-average target allocations of pension plans |
Target plan asset allocation range, Minimum | 30.00%
Target plan asset allocation range, Maximum | 80.00%
Target plan asset allocations | 60.00%
Fixed Income [Member] |
Weighted-average target allocations of pension plans |
Target plan asset allocation range, Minimum | 20.00%
Target plan asset allocation range, Maximum | 70.00%
Target plan asset allocations | 40.00%
Cash and Equivalents [Member] |
Weighted-average target allocations of pension plans |
Target plan asset allocation range, Minimum | 0.00%
Target plan asset allocation range, Maximum | 10.00%

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