Acquisitions (Unaudited Pro Forma Condensed Consolidated Income Statement Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition Pro Forma Information [Abstract]
Net service revenues	$ 193,987	$ 187,846	$ 573,917	$ 541,646
Operating income from continuing operations	12,269	9,291	32,136	26,328
Net income from continuing operations	$ 9,458	$ 6,922	$ 25,663	$ 20,518
Basic income per share	$ 0.61	$ 0.50	$ 1.65	$ 1.55