Defined Benefit Post-Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Post-Retirement Plans [Abstract]
Employer contributions	$ 0	$ 0	$ 0	$ 0
Pension Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	534	485	1,068	970
Interest cost	694	677	1,388	1,354
Expected return on plan assets	(2,228)	(2,203)	(4,456)	(4,406)
Net amortization	185	313	370	626
Net periodic pension (benefit) cost	(815)	(728)	(1,630)	(1,456)
Other Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	2	2	4	4
Interest cost	41	45	82	90
Expected return on plan assets	0	0	0	0
Net amortization	1	13	2	26
Net periodic pension (benefit) cost	$ 44	$ 60	$ 88	$ 120