Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenues	$ 400,646	$ 409,586	$ 815,408	$ 810,406
Expenses:
Subadvisory, distribution and other asset management costs	44,182	46,177	89,519	89,982
Software royalties and other information processing costs	7,389	7,393	14,836	15,521
Compensation, benefits and other personnel	125,331	125,999	256,812	256,334
Stock-based compensation	7,062	5,064	13,991	10,102
Consulting, outsourcing and professional fees	57,111	45,330	110,401	95,536
Data processing and computer related	24,506	22,184	47,210	43,176
Facilities, supplies and other costs	13,973	17,100	30,769	35,845
Amortization	13,140	12,781	26,217	25,460
Depreciation	7,640	7,422	15,113	14,753
Total expenses	300,334	289,450	604,868	586,709
Income from operations	100,312	120,136	210,540	223,697
Net gain (loss) from investments	1,903	231	(2,086)	1,510
Interest and dividend income	1,370	4,313	4,573	8,570
Interest expense	(151)	(166)	(303)	(323)
Equity in earnings of unconsolidated affiliate	28,276	37,832	58,183	75,149
Income before income taxes	131,710	162,346	270,907	308,603
Income taxes	30,644	35,806	60,599	68,082
Net income	$ 101,066	$ 126,540	$ 210,308	$ 240,521
Basic earnings per common share (in USD per share)	$ 0.69	$ 0.83	$ 1.42	$ 1.58
Shares used to compute basic earnings per share (in shares)	147,478	151,863	148,473	152,587
Diluted earnings per common share (in USD per share)	$ 0.68	$ 0.82	$ 1.39	$ 1.54
Shares used to compute diluted earnings per share (in shares)	149,598	155,165	150,983	155,853
Dividends declared per common share (in USD per share)	$ 0.35	$ 0.33	$ 0.35	$ 0.33
Asset management, administration and distribution fees
Revenues:
Revenues	$ 320,577	$ 324,925	$ 652,430	$ 638,869
Information processing and software servicing fees
Revenues:
Revenues	$ 80,069	$ 84,661	$ 162,978	$ 171,537