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Pension 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 net periodic benefit cost        
Service cost $ 325 $ 251 $ 975 $ 753
Interest cost 353 343 1,058 1,029
Expected return on plan assets (297) (273) (890) (817)
Recognized net actuarial loss 187 103 562 309
Net periodic benefit cost $ 568 $ 424 $ 1,705 $ 1,274