Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Revenues	$ 603,896	$ 563,246	$ 552,235
Operating Expenses
Employment expenses	267,299	240,521	238,501
Distribution and other asset-based expenses	77,010	82,099	92,441
Restructuring and severance	1,155	2,302	87
Depreciation expense	4,660	4,992	4,597
Amortization expense	30,127	30,244	25,142
Total operating expenses	460,732	438,536	439,136
Operating Income (Loss)	143,164	124,710	113,099
Other Income (Expense)
Other income (expense), net	1,876	2,411	3,289
Total other income (expense), net	7,050	8,253	(23,180)
Interest Income (Expense)
Total interest income (expense), net	13,684	7,722	19,122
Income (Loss) Before Income Taxes	163,898	140,685	109,041
Income tax expense (benefit)	43,935	35,177	32,961
Net Income (Loss)	119,963	105,508	76,080
Noncontrolling interests	(40,006)	(9,859)	(551)
Net Income (Loss) Attributable to Stockholders	79,957	95,649	75,529
Preferred stockholder dividends	0	(8,337)	(8,337)
Net Income (Loss) Attributable to Common Stockholders	$ 79,957	$ 87,312	$ 67,192
Earnings (Loss) per Share—Basic (in dollars per share)	$ 10.49	$ 12.54	$ 9.37
Earnings (Loss) per Share—Diluted (in dollars per share)	$ 10.02	$ 11.74	$ 8.86
Weighted Average Shares Outstanding—Basic (in shares)	7,620	6,963	7,174
Weighted Average Shares Outstanding—Diluted (in shares)	7,976	8,149	8,527
Consolidated entity excluding consolidated investment products
Operating Expenses
Other operating expenses	$ 69,896	$ 74,363	$ 74,853
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	7,139	7,044	(5,217)
Interest Income (Expense)
Interest expense	(11,894)	(19,473)	(19,445)
Interest and dividend income	1,367	3,844	4,999
CIP
Operating Expenses
Other operating expenses	10,585	4,015	3,515
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	(1,965)	(1,202)	(21,252)
Interest Income (Expense)
Interest expense	(85,437)	(92,005)	(64,788)
Interest and dividend income	109,648	115,356	98,356
Total investment management fees
Revenues
Revenues	505,338	461,477	437,021
Distribution and service fees
Revenues
Revenues	38,425	40,898	50,715
Administration and shareholder service fees
Revenues
Revenues	59,463	59,884	63,614
Other income and fees
Revenues
Revenues	$ 670	$ 987	$ 885