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Pension 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 net periodic benefit cost        
Service cost $ 351 $ 272 $ 650 $ 502
Interest cost 361 359 705 686
Expected return on plan assets (295) (272) (593) (544)
Recognized net actuarial loss (199) (123) (375) (206)
Net periodic benefit cost $ 616 $ 482 $ 1,137 $ 850