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Pension Plans (Details 5)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 4.50% 5.60% 6.00%
Rate of compensation increase 2.50% 3.50% 3.50%
Expected long-term return on plan assets 8.00% 8.00% 8.00%