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Pension Benefits (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
Net periodic pension cost        
Service cost $ 373 $ 303 $ 746 $ 606
Interest cost 299 301 598 602
Expected return on plan assets (406) (393) (812) (786)
Amortization of prior year service cost (5) 2 (10) 4
Amortization of transition asset (4) (4) (8) (8)
Recognized net actuarial loss 262 203 524 406
Net periodic pension cost $ 519 $ 412 $ 1,038 $ 824