401(k) Profit Sharing Plan (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, First One Percent of Contributions	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Next Five Percent of Contributions	50.00%
Defined Contribution Plan, Cost Recognized	$ 1.1	$ 1.2
Other Than SERP Hired Prior to 2010 [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	0.05%
Other Than SERP Hired Since Jan 1 2010 [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	4.00%