Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Revenues	$ 485,322	$ 424,927	$ 1,416,659	$ 1,240,335
Expenses:
Subadvisory, distribution and other asset management costs	55,619	45,126	161,610	134,645
Software royalties and other information processing costs	7,348	6,992	20,561	21,828
Compensation, benefits and other personnel	150,188	134,795	429,188	391,607
Stock-based compensation	11,318	6,467	31,173	20,458
Consulting, outsourcing and professional fees	55,868	57,949	165,657	168,350
Data processing and computer related	26,650	24,437	79,746	71,647
Facilities, supplies and other costs	14,124	16,679	49,851	47,448
Amortization	14,674	13,200	43,749	39,417
Depreciation	8,408	7,945	25,141	23,058
Total expenses	344,197	313,590	1,006,676	918,458
Income from operations	141,125	111,337	409,983	321,877
Net (loss) gain from investments	(575)	776	134	(1,310)
Interest and dividend income	892	1,009	2,715	5,582
Interest expense	(101)	(153)	(354)	(456)
Equity in earnings of unconsolidated affiliate	35,005	28,305	103,420	86,488
Income before income taxes	176,346	141,274	515,898	412,181
Income taxes	38,301	30,178	114,605	90,777
Net income	$ 138,045	$ 111,096	$ 401,293	$ 321,404
Basic earnings per common share (in USD per share)	$ 0.98	$ 0.76	$ 2.83	$ 2.18
Shares used to compute basic earnings per share (in shares)	140,507	145,812	141,928	147,586
Diluted earnings per common share (in USD per share)	$ 0.97	$ 0.75	$ 2.79	$ 2.14
Shares used to compute diluted earnings per share (in shares)	142,426	147,907	143,981	149,958
Dividends declared per common share (in USD per share)	$ 0	$ 0	$ 0.37	$ 0.35
Asset management, administration and distribution fees
Revenues:
Revenues	$ 393,296	$ 339,609	$ 1,143,451	$ 992,039
Information processing and software servicing fees
Revenues:
Revenues	$ 92,026	$ 85,318	$ 273,208	$ 248,296