Pension And Other Post-Retirement Benefit Obligations - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 913	$ 1,025
Interest cost	965	917
Expected return on plan assets	(1,478)	(1,174)
Amortization of unrecognized items	62	176
Net benefit costs	462	944
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	49	79
Interest cost	105	102
Expected return on plan assets	0	0
Amortization of unrecognized items	(178)	(206)
Net benefit costs	$ (24)	$ (25)