Impact of the COVID-19 Pandemic (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Impact Of COVID-19 Pandemic [Line Items]
Revenue decrease	6.50%
Operating income improvement from prior year period	$ 3.5
Deferred social security tax payments		$ 1.6
Tax Year 2021 [Member]
Impact Of COVID-19 Pandemic [Line Items]
Percentage of deferred social security payments due		50.00%
Tax Year 2022 [Member]
Impact Of COVID-19 Pandemic [Line Items]
Percentage of deferred social security payments due		50.00%