Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net income	$ 188,016	$ 196,758
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	27,045	25,631
Amortization and impairment of intangible assets	7,320	8,515
Acquisition-related contingent consideration	863	(1,014)
Provision for expected credit losses	13,101	14,816
Share-based compensation	18,491	17,150
Amortization of debt discount and issuance costs and other	1,588	8,551
Deferred income taxes	(9,140)	5,128
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(251,280)	(115,544)
Notes receivable	838	4,392
Prepaid expenses and other assets	(3,066)	1,145
Accounts payable, accrued expenses and other	21,936	(22,745)
Income taxes	3,940	18,025
Accrued compensation	(67,763)	2,803
Billings in excess of services provided	7,672	(7,691)
Net cash provided by (used in) operating activities	(40,439)	155,920
Investing activities
Payments for acquisition of businesses, net of cash received	(6,742)	(9,833)
Purchases of property and equipment and other	(38,935)	(52,441)
Net cash used in investing activities	(45,677)	(62,274)
Financing activities
Borrowings under revolving line of credit	165,000	377,500
Repayments under revolving line of credit	(165,000)	(352,500)
Purchase and retirement of common stock	(23,530)	(46,133)
Share-based compensation tax withholdings and other	(15,663)	(8,277)
Payments for business acquisition liabilities	(4,848)	(7,496)
Deposits and other	7,092	1,928
Net cash used in financing activities	(36,949)	(34,978)
Effect of exchange rate changes on cash and cash equivalents	(44,373)	(11,094)
Net increase (decrease) in cash and cash equivalents	(167,438)	47,574
Cash and cash equivalents, beginning of period	494,485	294,953
Cash and cash equivalents, end of period	327,047	342,527
Supplemental cash flow disclosures
Cash paid for interest	8,012	8,756
Cash paid for income taxes, net of refunds	51,353	31,240
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	1,664	2,603
Business acquisition liabilities not yet paid	5,593	0
Non-cash additions to property and equipment	$ 4,970	$ 4,435