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Employee Benefit Plans (Schedule of Components of Net Periodic Pension Cost) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plans [Abstract]    
Service cost      
Interest cost 3,574 3,545
Expected return on plan assets (4,650) (4,738)
Recognized gains 1,481 1,034
Prior service cost recognized      
Net periodic pension cost $ 405 $ (159)