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Employee Benefit Plans (Details 5) (Pension Plan, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plan
      
Service cost - benefits earned during the period    $ 1,835 $ 1,782
Interest cost on projected benefit obligation 1,284 1,451 1,638
Expected return on plan assets (2,307) (1,969) (1,716)
Net amortization and deferral 49 559 395
Net periodic pension (income) cost $ 974 $ (1,876) $ 2,099