CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 132,990	$ 251,598	$ 411,146
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for credit losses	3,151	5,286	8,752
Depreciation	50,031	52,053	51,364
Amortization of cloud computing implementation costs	29,722	36,045	44,720
Amortization of intangible assets	1,873	1,217	2,883
Realized and unrealized gains from investments held in employee deferred compensation trusts	(78,871)	(71,656)	(72,971)
Stock-based compensation	59,416	63,448	61,139
Deferred income taxes	22,847	(17,936)	(16,568)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	45,797	66,954	156,269
Capitalized cloud computing implementation costs	(28,522)	(29,210)	(34,895)
Accounts payable and accrued expenses	(15,220)	16,047	(14,698)
Accrued payroll and benefit cost	(1,829)	(32,963)	(61,725)
Employee deferred compensation plan obligations	93,227	105,490	98,802
Income taxes payable	(1,394)	(20,960)	10,721
Other assets and liabilities, net	6,747	(14,944)	(8,058)
Net cash flows provided by operating activities	319,965	410,469	636,881
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(53,155)	(56,318)	(45,874)
Investments in employee deferred compensation trusts	(80,078)	(69,237)	(102,969)
Proceeds from employee deferred compensation trust redemptions	58,251	38,700	37,628
Payments for acquisitions, net of cash acquired	(10,722)	(264)	(1,035)
Net cash flows used in investing activities	(85,704)	(87,119)	(112,250)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchases of common stock	(92,093)	(276,032)	(254,625)
Dividends paid	(238,220)	(220,409)	(205,910)
Net cash flows used in financing activities	(330,313)	(496,441)	(460,535)
Effect of exchange rate fluctuations	22,904	(21,066)	9,018
Change in cash and cash equivalents	(73,148)	(194,157)	73,114
Cash and cash equivalents at beginning of period	537,583	731,740	658,626
Cash and cash equivalents at end of period	464,435	537,583	731,740
Cash paid during the year for:
Interest	225	272	315
Income taxes, net of refunds	41,633	143,615	168,488
Non-cash items:
Repurchases of common stock awaiting settlement	0	0	4,394
Fund exchanges within employee deferred compensation trusts	173,845	130,997	114,821
Contingent consideration related to acquisition	$ 2,685	$ 0	$ 350