401(k) Profit Sharing Plan (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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	$ 1.2	$ 1.1
Other Than SERP Hired Prior to 2010 [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	0.50%
Other Than SERP Hired Since Jan 1 2010 [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	4.00%