Consolidated Statements of Operations and Other Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues and reimbursable expenses:
Revenues	$ 358,178	$ 285,370	$ 1,022,832	$ 818,744
Reimbursable expenses	9,288	6,816	25,918	19,034
Total revenues and reimbursable expenses	367,466	292,186	1,048,750	837,778
Operating expenses:
Direct costs (exclusive of depreciation and amortization included below)	244,774	193,368	708,355	569,848
Reimbursable expenses	9,497	6,917	26,242	19,249
Selling, general and administrative expenses	64,347	54,458	190,655	148,886
Restructuring charges	5,402	1,332	9,385	4,956
Depreciation and amortization	6,104	6,812	18,621	20,578
Total operating expenses	330,124	262,887	953,258	763,517
Operating income	37,342	29,299	95,492	74,261
Other income (expense), net:
Interest expense, net of interest income	(5,047)	(3,111)	(15,146)	(7,753)
Other income (expense), net	(1,000)	(785)	1,781	18,699
Total other income (expense), net	(6,047)	(3,896)	(13,365)	10,946
Income before taxes	31,295	25,403	82,127	85,207
Income tax expense	9,779	7,662	22,480	26,739
Net income	$ 21,516	$ 17,741	$ 59,647	$ 58,468
Earnings per share:
Net income per basic share (in dollars per share)	$ 1.15	$ 0.88	$ 3.15	$ 2.85
Net income (USD per share)	$ 1.10	$ 0.86	$ 3.05	$ 2.80
Weighted average shares used in calculating earnings per share:
Basic (shares)	18,770	20,109	18,941	20,511
Diluted (shares)	19,475	20,615	19,578	20,899
Comprehensive income (loss):
Net income (loss)	$ 21,516	$ 17,741	$ 59,647	$ 58,468
Foreign currency translation adjustments, net of tax	(662)	(1,034)	(283)	(1,733)
Unrealized gain (loss) on investment, net of tax	(1,350)	(830)	3,076	(2,718)
Unrealized gain (loss) on cash flow hedging instruments, net of tax	(368)	3,762	(234)	9,058
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	(2,380)	1,898	2,559	4,607
Comprehensive income	$ 19,136	$ 19,639	$ 62,206	$ 63,075