Pension and Other Postretirement Benefit Plans - Schedule of Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	$ 549,571	$ 540,225
Level 1
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	116	101
Level 2
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	0	0
Defined Benefit Plan, Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	116	101
Defined Benefit Plan, Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	116	101
Defined Benefit Plan, Cash and Cash Equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	0	0
Defined Benefit Plan, Cash and Cash Equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	0	0
Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	549,455	540,124
Private Equity Funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	0	0
Private Equity Funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	0	0
Private Equity Funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit plan assets	$ 0	$ 0