CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
REVENUES
Commissions and fees	$ 725,919	$ 598,157	$ 1,539,956	$ 1,294,660
Investment income	229	333	479	1,495
Other income, net	1,204	316	2,193	1,147
Total revenues	727,352	598,806	1,542,628	1,297,302
EXPENSES
Employee compensation and benefits	395,611	346,515	825,111	696,139
Other operating expenses	96,255	75,568	190,619	182,700
(Gain)/loss on disposal	(3,851)	(31)	(4,044)	(291)
Amortization	29,546	26,741	59,039	53,132
Depreciation	8,801	6,168	16,257	12,189
Interest	16,285	13,809	32,626	29,100
Change in estimated acquisition earn-out payables	(1,604)	635	(2,495)	(10,322)
Total expenses	541,043	469,405	1,117,113	962,647
Income before income taxes	186,309	129,401	425,515	334,655
Income taxes	47,019	32,617	86,482	85,471
Net income	$ 139,290	$ 96,784	$ 339,033	$ 249,184
Net income per share:
Basic (in dollars per share)	$ 0.49	$ 0.34	$ 1.20	$ 0.88
Diluted (in dollars per share)	0.49	0.34	1.20	0.88
Dividends declared per share (in dollars per share)	$ 0.093	$ 0.085	$ 0.185	$ 0.170