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Employee Benefit Plans (Schedule of Funded Status) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plans [Abstract]    
Funded status $ (19,626) $ (19,082)
Unrecognized net actuarial loss 47,016 43,719
Unrecognized prior service cost      
Net amount recognized $ 27,390 $ 24,637