Pension and Other Post-Retirement Benefit Plans - Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0	$ 0
Interest cost	8,631	6,011
Expected return on plan assets	(10,192)	(11,738)
Curtailments and settlements	0	0
Amortization of prior service cost	0	0
Amortization of net loss	4,745	313
Net periodic benefit cost (income)	3,184	(5,414)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	13	19
Interest cost	33	15
Expected return on plan assets	0	0
Curtailments and settlements	0	0
Amortization of prior service cost	0	0
Amortization of net loss	0	11
Net periodic benefit cost (income)	$ 46	$ 45