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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Components of net periodic pension expense:        
Interest cost $ 606 $ 614 $ 1,817 $ 1,841
Expected return on plan assets (630) (600) (1,890) (1,799)
Amortization of net loss 277 228 831 683
Net periodic pension expense $ 253 $ 242 $ 758 $ 725