Pension and Other Postretirement Benefits - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	$ 301,378	$ 281,332
U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	34,966	49,153
Non-U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	35,939	51,227
Government bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	77,480	56,318
Corporate bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	62,456	67,406
Fixed income fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	22,673	22,680
Liability driven investment fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	51,412	14,629
Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	9,565	10,531
Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	6,887	9,388
Quoted  Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	2,662	13,019
Quoted  Prices in Active Markets for Identical Assets (Level 1) | U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	4,384
Quoted  Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	5,393
Quoted  Prices in Active Markets for Identical Assets (Level 1) | Government bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Quoted  Prices in Active Markets for Identical Assets (Level 1) | Corporate bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Quoted  Prices in Active Markets for Identical Assets (Level 1) | Fixed income fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Quoted  Prices in Active Markets for Identical Assets (Level 1) | Liability driven investment fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Quoted  Prices in Active Markets for Identical Assets (Level 1) | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Quoted  Prices in Active Markets for Identical Assets (Level 1) | Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	2,662	3,242
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	9,186
Significant Observable Inputs (Level 2) | U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Significant Observable Inputs (Level 2) | Non-U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Significant Observable Inputs (Level 2) | Government bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	2,011
Significant Observable Inputs (Level 2) | Corporate bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	7,175
Significant Observable Inputs (Level 2) | Fixed income fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Significant Observable Inputs (Level 2) | Liability driven investment fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Significant Observable Inputs (Level 2) | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Significant Observable Inputs (Level 2) | Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	0	0
Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	298,716	259,127
Investments Measured at Net Asset Value | U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	34,966	44,769
Investments Measured at Net Asset Value | Non-U.S. equities fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	35,939	45,834
Investments Measured at Net Asset Value | Government bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	77,480	54,307
Investments Measured at Net Asset Value | Corporate bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	62,456	60,231
Investments Measured at Net Asset Value | Fixed income fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	22,673	22,680
Investments Measured at Net Asset Value | Liability driven investment fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	51,412	14,629
Investments Measured at Net Asset Value | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	9,565	10,531
Investments Measured at Net Asset Value | Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets by asset category	$ 4,225	$ 6,146