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Pension Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Components of Net Periodic Benefit Costs for the Pension Plans |  |  |  |
Service cost | $ 1,683 | $ 1,660 | $ 5,048 | $ 4,979
Interest cost | 657 | 673 | 1,967 | 2,017
Expected return on plan assets that reduces periodic pension benefit cost | (466) | (561) | (1,397) | (1,683)
Amortization of prior service cost | 4 | 4 | 13 | 13
Amortization of net actuarial loss | 331 | 324 | 995 | 973
Net periodic benefit cost | $ 2,209 | $ 2,100 | $ 6,626 | $ 6,299

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