Defined Benefit Post-Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Post-Retirement Plans [Abstract]
Employer contributions	$ 0	$ 0	$ 0	$ 0
Pension Benefits [Member]
Components of net periodic cost (benefit) [Abstract]
Service cost	482	534	964	1,068
Interest cost	1,010	694	2,020	1,388
Expected return on plan assets	(1,853)	(2,228)	(3,706)	(4,456)
Net amortization	670	185	1,340	370
Net periodic pension cost (benefit)	309	(815)	618	(1,630)
Other Benefits [Member]
Components of net periodic cost (benefit) [Abstract]
Service cost	1	2	2	4
Interest cost	56	41	112	82
Expected return on plan assets	0	0	0	0
Net amortization	(21)	1	(42)	2
Net periodic pension cost (benefit)	$ 36	$ 44	$ 72	$ 88