Pension and Other Post-Retirement Benefit Plans - Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0	$ 0	$ 0
Interest cost	24,173	22,387	27,880
Expected return on plan assets	(46,954)	(47,502)	(44,673)
Curtailments and settlements	0	0	(424)
Amortization of prior service cost	0	0	0
Amortization of net loss	2,630	7,058	3,763
Net periodic benefit cost (income)	(20,151)	(18,057)	(13,454)
Post-retirement Healthcare Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	76	95	139
Interest cost	59	42	91
Expected return on plan assets	0	0	0
Curtailments and settlements	0	0	(17)
Amortization of prior service cost	0	0	0
Amortization of net loss	45	186	124
Net periodic benefit cost (income)	$ 180	$ 323	$ 337