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Retirement 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 for pension plans        
Service cost $ 1,147 $ 1,066 $ 2,295 $ 2,132
Interest cost 830 753 1,660 1,506
Expected return on plan assets (682) (616) (1,365) (1,232)
Loss amortization 576 154 1,151 308
Net periodic benefit cost $ 1,871 $ 1,357 $ 3,741 $ 2,714