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Employee Benefit Plans (Details 4)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted average discount rate 4.75% 5.75% 6.25%
Rate of increase in compensation levels 4.00% 4.00% 4.00%
Expected long-term rate of return on assets 7.25% 7.25% 7.25%