Consolidated Condensed Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net income	$ 151,517	$ 131,400
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,927	8,389
Amortization	10,710	10,386
Equity in earnings of unconsolidated affiliate	(28,747)	(31,643)
Distributions received from unconsolidated affiliate	34,860	33,147
Stock-based compensation	14,138	11,059
Provision for losses on receivables	420	502
Deferred income tax expense	(4,142)	(7,150)
Net gain from investments	(493)	(2,256)
Change in other long-term liabilities	508	850
Change in other assets	(1,213)	(7,800)
Contract costs capitalized, net of amortization	(2,291)	221
Contingent consideration fair value adjustments	(1,351)	0
Other	33	(2,068)
Change in current assets and liabilities:
Receivables from investment products	4,658	280
Receivables	(43,091)	(60,386)
Other current assets	(2,674)	1,268
Advances due from unconsolidated affiliate	54,513	51,986
Accounts payable	(1,913)	(328)
Accrued liabilities	(48,966)	(25,471)
Deferred revenue	2,077	(92)
Total adjustments	(5,037)	(19,106)
Net cash provided by operating activities	146,480	112,294
Cash flows from investing activities:
Additions to property and equipment	(8,666)	(13,072)
Additions to capitalized software	(7,362)	(6,277)
Purchases of marketable securities	(50,113)	(41,650)
Purchases of interest in limited partnerships	(566)	0
Prepayments and maturities of marketable securities	30,949	32,116
Proceeds from fixed asset dispositions	1,165	1,180
Other investing activities	(3,757)	(9,931)
Net cash used in investing activities	(38,350)	(37,634)
Cash flows from financing activities:
Purchase and retirement of common stock	(203,723)	(46,825)
Proceeds from issuance of common stock	24,494	45,027
Payment of dividends	(62,319)	(60,359)
Net cash used in financing activities	(241,548)	(62,157)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	4,212	(572)
Net (decrease) increase in cash, cash equivalents and restricted cash	(129,206)	11,931
Cash, cash equivalents and restricted cash, beginning of period	840,193	834,998
Cash, cash equivalents and restricted cash, end of period	$ 710,987	$ 846,929