Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 142,654	$ 168,182	$ 314,066	$ 316,135
Cost of services:
Compensation	62,394	58,322	129,849	115,775
Direct project and other operating expenses	22,984	20,742	47,879	40,941
Information technology	15,125	12,316	30,028	25,420
Occupancy	4,190	4,052	8,552	8,131
Amortization of acquisition related software and intangible assets	5,564	4,166	11,069	8,332
Total cost of services	110,257	99,598	227,377	198,599
Selling, general and administrative expenses	26,781	28,036	62,620	57,282
Total operating expenses	137,038	127,634	289,997	255,881
Operating income	5,616	40,548	24,069	60,254
Interest expense	(1,947)	(2,853)	(4,209)	(5,702)
Interest income	24	966	258	2,080
Other income	2,219	0	2,871	0
Income before income taxes	5,912	38,661	22,989	56,632
Income taxes	(701)	9,561	3,694	7,890
Net income	$ 6,613	$ 29,100	$ 19,295	$ 48,742
Basic income per common share:
Net income per common share -- basic (in dollars per share)	$ 0.07	$ 0.34	$ 0.22	$ 0.56
Diluted income per common share:
Net income per common share -- diluted (in dollars per share)	$ 0.07	$ 0.33	$ 0.21	$ 0.55
Weighted average shares:
Basic (in shares)	88,244	85,956	88,328	86,524
Diluted (in shares)	89,834	87,858	89,842	88,843