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Benefit Plans (Details 5) (Pension Plans, Defined Benefit [Member])
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
     
Weighted average assumptions used to determine net periodic benefit cost      
Discount rate 4.50% 5.50% 6.00%
Expected return on plan assets 8.00% 8.00% 8.00%
Rate of compensation increase 3.00% 4.00% 4.00%