Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities
Net income	$ 163,912	$ 109,942
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	21,173	19,547
Amortization of intangible assets	2,096	3,599
Provision for expected credit losses	19,923	11,188
Share-based compensation	18,101	13,903
Deferred income taxes	(6,840)	(6,571)
Acquisition-related contingent consideration	(1,157)	3,543
Amortization of debt issuance costs and other	387	1,296
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(115,106)	(245,999)
Notes receivable	(45,197)	(22,539)
Prepaid expenses and other assets	(12,630)	(6,718)
Accounts payable, accrued expenses and other	(8,934)	(159)
Income taxes	(29,727)	(13,122)
Accrued compensation	(145,509)	(130,625)
Billings in excess of services provided	(84)	(2,485)
Net cash used in operating activities	(139,592)	(265,200)
Investing activities
Purchases of property and equipment and other	(14,700)	(29,027)
Maturity of short-term investment	25,246	0
Net cash provided by (used in) investing activities	10,546	(29,027)
Financing activities
Borrowings under revolving line of credit	520,000	245,000
Repayments under revolving line of credit	(460,000)	(220,000)
Purchase and retirement of common stock	0	(20,982)
Share-based compensation tax withholdings	(14,320)	(11,922)
Proceeds on stock option exercises	10,614	1,167
Deposits and other	2,023	(2,206)
Net cash provided by (used in) financing activities	58,317	(8,943)
Effect of exchange rate changes on cash and cash equivalents	(6,065)	15,021
Net decrease in cash and cash equivalents	(76,794)	(288,149)
Cash and cash equivalents, beginning of period	303,222	491,688
Cash and cash equivalents, end of period	226,428	203,539
Supplemental cash flow disclosures
Cash paid for interest	4,020	4,144
Cash paid for income taxes and tax credits, net of refunds	74,831	57,376
Non-cash financing activities:
Issuance of stock units under incentive compensation plans	$ 2,805	$ 2,274