Pension Plans and Other Postretirement Benefits - Financial Assets Accounted for at Fair Value on Recurring Basis (Details) - Pension Plans - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 549,645	$ 528,057
Quoted Prices in Active Markets for Identical Items (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	425,203	416,881
Quoted Prices in Active Markets for Identical Items (Level 1) | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	58,906	97,984
Quoted Prices in Active Markets for Identical Items (Level 1) | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	99,432	79,815
Quoted Prices in Active Markets for Identical Items (Level 1) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	257,299	235,184
Quoted Prices in Active Markets for Identical Items (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,566	3,898
Quoted Prices in Active Markets for Similar Items (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43,900	42,451
Quoted Prices in Active Markets for Similar Items (Level 2) | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	96
Quoted Prices in Active Markets for Similar Items (Level 2) | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,059	8,187
Quoted Prices in Active Markets for Similar Items (Level 2) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36,841	34,168
Quoted Prices in Active Markets for Similar Items (Level 2) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Absolute Return Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80,542	68,725
Fair Value, Inputs, Level 1, 2 and 3 | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	58,906	98,080
Fair Value, Inputs, Level 1, 2 and 3 | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106,491	88,002
Fair Value, Inputs, Level 1, 2 and 3 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	294,140	269,352
Fair Value, Inputs, Level 1, 2 and 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 9,566	$ 3,898