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Pension Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Components of Net Periodic Benefit Costs for the Pension Plans        
Service cost $ 1,395 $ 1,683 $ 4,186 $ 5,048
Interest cost 699 657 2,094 1,967
Expected return on plan assets that reduces periodic pension benefit cost (393) (466) (1,180) (1,397)
Amortization of prior service cost 4 4 13 13
Amortization of net actuarial loss 239 331 718 995
Net periodic benefit cost $ 1,944 $ 2,209 $ 5,831 $ 6,626