Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net service revenues	$ 193,987	$ 168,993	$ 568,779	$ 456,415
Cost of service revenues	137,686	123,817	401,646	334,719
Gross profit	56,301	45,176	167,133	121,696
General and administrative expenses	40,733	35,085	125,470	94,109
Depreciation and amortization	3,045	2,756	8,872	7,365
Total operating expenses	43,778	37,841	134,342	101,474
Operating income from continuing operations	12,523	7,335	32,791	20,222
Interest income	(87)	(786)	(576)	(1,096)
Interest expense	680	866	2,309	2,164
Total interest expense, net	(593)	(80)	(1,733)	(1,068)
Income from continuing operations before income taxes	11,930	7,255	31,058	19,154
Income tax expense	2,811	1,769	6,374	4,080
Net income from continuing operations	9,119	5,486	24,684	15,074
Net loss from discontinued operations		(574)		(574)
Net income	$ 9,119	$ 4,912	$ 24,684	$ 14,500
Basic income per share
Continuing operations	$ 0.58	$ 0.40	$ 1.59	$ 1.14
Discontinued operations		(0.04)		(0.04)
Basic income per share	0.58	0.36	1.59	1.10
Diluted income per share
Continuing operations	0.57	0.39	1.55	1.10
Discontinued operations		(0.04)		(0.04)
Diluted income per share	$ 0.57	$ 0.35	$ 1.55	$ 1.06
Weighted average number of common shares and potential common shares outstanding:
Basic	15,618	13,766	15,573	13,271
Diluted	15,957	14,203	15,934	13,687