Employee Benefit Plans (Changes in Accumulated Postretirement Benefits Obligations) (Details) - Postretirement Medical and Life Benefit Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at the Beginning of Year	$ 1,634	$ 1,498
Unrecognized Loss (Gain)	(68)	114
Components of Net Periodic Postretirement Benefit Cost
Service Cost	119	110	$ 83
Interest Cost	28	41	43
Net Expected Benefit Payments	(121)	(96)
Amendments	0	(33)
Obligation at End of Year	$ 1,592	$ 1,634	$ 1,498