Defined Benefit Post-Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Post-Retirement Plans [Abstract]
Employer contributions	$ 0	$ 0
Pension Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	534	485
Interest cost	694	677
Expected return on plan assets	(2,228)	(2,203)
Net amortization	185	313
Net periodic pension (benefit) cost	(815)	(728)
Other Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	2	2
Interest cost	41	45
Expected return on plan assets	0	0
Net amortization	1	13
Net periodic pension (benefit) cost	$ 44	$ 60