Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Revenue before reimbursements (net revenue)	$ 183,059	$ 152,214	$ 343,130	$ 292,220
Reimbursements	4,630	4,904	9,217	9,075
Total revenue	187,689	157,118	352,347	301,295
Operating expenses
Salaries and employee benefits	127,679	103,378	239,088	200,613
General and administrative expenses	36,919	38,089	72,460	74,222
Goodwill and Intangible Asset Impairment	0	39,158	0	39,158
Reimbursed expenses	4,630	4,904	9,217	9,075
Total operating expenses	169,228	185,529	320,765	323,068
Operating income (loss)	18,461	(28,411)	31,582	(21,773)
Non-operating income (expense)
Interest, net	(2)	(96)	237	101
Other, net	(48)	(179)	(496)	(2,920)
Net non-operating expense	(50)	(275)	(259)	(2,819)
Income (loss) before income taxes	18,411	(28,686)	31,323	(24,592)
Provision for (benefit from) income taxes	(6,948)	10,438	(9,692)	6,994
Net income (loss)	11,463	(18,248)	21,631	(17,598)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(3,816)	2,967	(2,226)	4,784
Net unrealized gain on available-for-sale investments	0	426	0	1,234
Other comprehensive income (loss), net of tax	(3,816)	3,393	(2,226)	6,018
Comprehensive income (loss)	$ 7,647	$ (14,855)	$ 19,405	$ (11,580)
Basic weighted average common shares outstanding (in shares)	18,934	18,749	18,880	18,689
Diluted weighted average common shares outstanding (in shares)	19,328	18,749	19,389	18,689
Basic net income per common share (in USD per share)	$ 0.61	$ (0.97)	$ 1.15	$ (0.94)
Diluted net income per common share (in USD per share)	0.59	(0.97)	1.12	(0.94)
Cash dividends paid per share (in USD per share)	$ 0.13	$ 0.13	$ 0.26	$ 0.26