Employee Benefit Plans (Changes in Accumulated Postretirement Benefits Obligations) (Details) - Postretirement Medical and Life Benefit Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at the Beginning of Year	$ 1,592	$ 1,634
Unrecognized Loss (Gain)	(71)	(68)
Components of Net Periodic Postretirement Benefit Cost
Service Cost	105	119	$ 110
Interest Cost	35	28	41
Net Expected Benefit Payments	(131)	(121)
Amendments	0	0
Obligation at End of Year	$ 1,530	$ 1,592	$ 1,634