Post-Retirement Plan (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Post-Retirement Plan [Abstract]
Matching contribution, percentage	50.00%	50.00%	50.00%
Employer contribution, percet of employee's gross pay	6.00%	6.00%	6.00%
Contribution, amount	$ 3.2	$ 2.5	$ 1.9