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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Components of the net periodic benefit cost of the plan        
Service cost $ 107 $ 90 $ 214 $ 180
Interest cost 67 77 135 153
Expected return on plan assets (69) (85) (138) (170)
Amortization of prior service cost 1 1 1 2
Amortization of net loss 21 9 43 18
Net periodic benefit cost $ 127 $ 92 $ 255 $ 183