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Employee Benefit Plans (Details) (Pension Plan, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plan
      
Benefit obligation at beginning of year $ 32,272 $ 40,084 $ 31,140
Service cost    1,835 1,782
Interest cost 1,284 1,451 1,638
Actuarial (gain) loss (2,343) (4,006) 6,004
Benefits paid (665) (503) (480)
Curtailment gain    (6,589)   
Benefit obligation at end of year 30,548 32,272 40,084
Plan assets at beginning of year 30,124 24,466 22,431
Actual return on plan assets 6,874 3,661 15
Employer contributions    2,500 2,500
Benefits paid - plan (665) (503) (480)
Plan assets at end of year 36,333 30,124 24,466
Funded status at end of year $ 5,785 $ (2,148) $ (15,618)