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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Components of net periodic pension expense:        
Interest cost $ 605 $ 614 $ 1,211 $ 1,227
Expected return on plan assets (630) (600) (1,260) (1,199)
Amortization of net loss 277 228 554 455
Net periodic pension expense $ 252 $ 242 $ 505 $ 483