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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Components of net periodic pension expense:    
Interest cost $ 606 $ 613
Expected return on plan assets (630) (599)
Amortization of net loss 277 227
Net periodic pension expense $ 253 $ 241