Pension and Other Post-Retirement Benefit Plans - Fair Value of Plan Assets (Details) - Pension Plans - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 523,376	$ 627,032	$ 850,195
Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	410,712	627,029
Total
Defined Benefit Plan Disclosure [Line Items]
Plan assets	410,712	627,029
Common trust funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Common trust funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2,908	19,114
Common trust funds | Total
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2,908	19,114
Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34,569	166,143
Mutual funds | Total
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34,569	166,143
Fixed income investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Fixed income investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	373,235	441,772
Fixed income investments | Total
Defined Benefit Plan Disclosure [Line Items]
Plan assets	373,235	441,772
Investments measured at net asset value ("NAV")
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 112,664	$ 3