Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Operating income from continuing operations	$ 12,523	$ 7,335	$ 32,791	$ 20,222
Other general and administrative expenses	19,067	17,680	58,939	46,907
Depreciation and amortization	3,045	2,756	8,872	7,365
Interest income	(87)	(786)	(576)	(1,096)
Interest expense	680	866	2,309	2,164
Income from continuing operations before income taxes	11,930	7,255	31,058	19,154
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income from continuing operations	$ 34,635	$ 27,771	$ 100,602	$ 74,494