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Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension Benefits |  |  |  |
Components of net periodic benefit cost (income) |  |  |  |
Service cost | $ 2,039 | $ 2,402 | $ 6,166 | $ 7,180
Interest cost | 2,016 | 2,194 | 6,161 | 7,244
Expected return on plan assets | (2,463) | (2,577) | (7,409) | (8,382)
Settlement expense | 531 | 1,241 | 2,068 | 5,091
Amortization of net loss (gain) | 845 | 1,356 | 2,961 | 3,663
Amortization of prior service cost (credit) | 69 | 70 | 210 | 209
Net periodic benefit cost (income) | 3,037 | 4,686 | 10,157 | 15,005
Postretirement Benefits |  |  |  |
Components of net periodic benefit cost (income) |  |  |  |
Service cost | 168 | 150 | 503 | 450
Interest cost | 75 | 108 | 226 | 324
Expected return on plan assets | 0 | 0 | 0 | 0
Settlement expense | 0 | 0 | 0 | 0
Amortization of net loss (gain) | (80) | (241) | (240) | (725)
Amortization of prior service cost (credit) | (35) | (35) | (103) | (103)
Net periodic benefit cost (income) | $ 128 | $ (18) | $ 386 | $ (54)

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