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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Components of the net periodic benefit cost of the plan        
Service cost $ 107 $ 90 $ 320 $ 270
Interest cost 67 77 202 231
Expected return on plan assets (69) (85) (206) (255)
Amortization of prior service cost 1 1 2 3
Amortization of net loss 21 9 64 27
Net periodic benefit cost $ 127 $ 92 $ 382 $ 276