CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 58,318	$ 131,857
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for credit losses	2,699	565
Depreciation	25,608	25,520
Amortization of cloud computing implementation costs	16,274	18,586
Amortization of intangible assets	825	608
Realized and unrealized gains from investments held in employee deferred compensation trusts	(32,488)	(54,411)
Stock-based compensation	31,235	32,408
Deferred income taxes	1,594	(4,227)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(30,562)	(42,521)
Capitalized cloud computing implementation costs	(13,217)	(15,557)
Accounts payable and accrued expenses	(25,387)	7,276
Accrued payroll and benefit costs	11,724	(22,558)
Employee deferred compensation plan obligations	21,548	55,077
Income taxes payable	4,089	1,834
Other assets and liabilities, net	(12,230)	(8,422)
Net cash flows provided by operating activities	60,030	126,035
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(27,573)	(24,174)
Investments in employee deferred compensation trusts	(51,135)	(42,718)
Proceeds from employee deferred compensation trust redemptions	40,081	29,695
Payments for acquisitions, net of cash acquired	(10,114)	(264)
Net cash flows used in investing activities	(48,741)	(37,461)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchases of common stock	(70,999)	(146,191)
Dividends paid	(120,659)	(112,248)
Net cash flows used in financing activities	(191,658)	(258,439)
Effect of exchange rate fluctuations	23,333	(14,505)
Change in cash and cash equivalents	(157,036)	(184,370)
Cash and cash equivalents at beginning of period	537,583	731,740
Cash and cash equivalents at end of period	380,547	547,370
Non-cash items:
Repurchases of common stock awaiting settlement	1,029	0
Fund exchanges within employee deferred compensation trusts	95,312	47,518
Contingent consideration related to acquisitions	$ 3,272	$ 26