Employee Benefit Plans (Changes in Accumulated Postretirement Benefits Obligations) (Details) - Postretirement Medical and Life Benefit Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at the Beginning of Year	$ 1,530	$ 1,592
Unrecognized Loss (Gain)	187	(71)
Components of Net Periodic Postretirement Benefit Cost
Service Cost	101	105	$ 119
Interest Cost	71	35	28
Net Expected Benefit Payments	(142)	(131)
Amendments	0	0
Obligation at End of Year	$ 1,747	$ 1,530	$ 1,592