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Employee Benefit Plans (Details 5) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plans [Abstract]    
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation $ 106,845,000 $ 89,531,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets $ 49,516,000 $ 41,300,000