CONDENSED CONSOLIDATED STATEMENTS OF INCOME 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:
Total revenues	$ 57,559	$ 76,407	$ 127,126	$ 150,743
Expenses:
Compensation	25,516	30,216	54,766	60,563
Management fee	2,060	4,709	3,725	6,158
Distribution costs	6,634	8,605	14,264	17,275
Other operating expenses	4,586	6,117	10,288	11,374
Total expenses	38,796	49,647	83,043	95,370
Operating income	18,763	26,760	44,083	55,373
Non-operating income / (loss)
Gain / (loss) from investments, net	309	5,264	(9,928)	3,369
Interest and dividend income	115	715	659	1,439
Interest expense	(647)	(655)	(1,294)	(1,310)
Total non-operating income / (loss)	(223)	5,324	(10,563)	3,498
Income before income taxes	18,540	32,084	33,520	58,871
Provision for income taxes	7,250	8,067	10,985	14,962
Net income	$ 11,290	$ 24,017	$ 22,535	$ 43,909
Earnings per share:
Basic (in dollars per share)	$ 0.42	$ 0.88	$ 0.85	$ 1.57
Diluted (in dollars per share)	$ 0.42	$ 0.88	$ 0.84	$ 1.57
Weighted average shares outstanding:
Basic (in shares)	26,629	27,357	26,658	27,929
Diluted (in shares)	26,656	27,413	26,713	27,973
Investment Advisory and Incentive Fees [Member]
Revenues:
Total revenues	$ 51,470	$ 67,990	$ 113,743	$ 133,878
Distribution Fees and Other Income [Member]
Revenues:
Total revenues	$ 6,089	$ 8,417	$ 13,383	$ 16,865