Pension and Other Post-Retirement Benefit Plans - Unrecognized Net Periodic Benefit Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	$ 0	$ 0
Unrecognized net actuarial loss	86,066	144,268
Accumulated other comprehensive loss	86,066	144,268
Net periodic benefit expense	10,400
Post-retirement Healthcare Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	0	0
Unrecognized net actuarial loss	(518)	76
Accumulated other comprehensive loss	(518)	$ 76
Net periodic benefit expense	$ (100)