CONDENSED CONSOLIDATED STATEMENTS OF INCOME - 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:
Total revenues	$ 75,907	$ 61,252	$ 219,459	$ 188,378
Expenses:
Compensation	21,965	17,722	83,945	72,488
Management fee	0	0	5,552	3,725
Distribution costs	7,781	6,994	22,523	21,258
Other operating expenses	5,485	4,694	19,460	14,982
Total expenses	35,231	29,410	131,480	112,453
Operating income	40,676	31,842	87,979	75,925
Non-operating income / (loss)
Gain / (loss) from investments, net	(1,290)	(3,133)	2,376	(13,061)
Interest and dividend income	72	41	359	700
Interest expense	(814)	(691)	(2,101)	(1,985)
Shareholder-designated contribution	0	(5,436)	0	(5,436)
Total non-operating income / (loss)	(2,032)	(9,219)	634	(19,782)
Income before income taxes	38,644	22,623	88,613	56,143
Provision for income taxes	9,483	6,188	26,401	17,173
Net income	$ 29,161	$ 16,435	$ 62,212	$ 38,970
Earnings per share:
Basic (in dollars per share)	$ 1.11	$ 0.62	$ 2.36	$ 1.46
Diluted (in dollars per share)	$ 1.09	$ 0.62	$ 2.32	$ 1.46
Weighted average shares outstanding:
Basic (in shares)	26,222	26,531	26,310	26,615
Diluted (in shares)	26,832	26,613	26,863	26,679
Investment Advisory and Incentive Fees [Member]
Revenues:
Total revenues	$ 69,147	$ 54,894	$ 199,502	$ 168,637
Distribution Fees and Other Income [Member]
Revenues:
Total revenues	$ 6,760	$ 6,358	$ 19,957	$ 19,741