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Pension and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension Benefits |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 109 | $ 166 | $ 320 | $ 520
Interest cost | 2,487 | 1,272 | 7,452 | 3,949
Expected return on plan assets | (2,033) | (1,942) | (6,056) | (6,038)
Actuarial loss (gain) amortization | 103 | 238 | 308 | 743
Prior service cost (income) amortization | 18 | 3 | 26 | 8
Net periodic benefit cost (income) | 684 | (263) | 2,050 | (818)
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 0 | 1 | 0 | 1
Interest cost | 14 | 8 | 51 | 19
Expected return on plan assets | 0 | 0 | 0 | 0
Actuarial loss (gain) amortization | (36) | (23) | (95) | (70)
Prior service cost (income) amortization | (4) | (8) | (12) | (17)
Net periodic benefit cost (income) | $ (26) | $ (22) | $ (56) | $ (67)

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