Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Revenues	$ 563,246	$ 552,235	$ 425,607
Operating Expenses
Employment expenses	240,521	238,501	191,394
Distribution and other asset-based expenses	82,099	92,441	71,987
Restructuring and severance	2,302	87	10,580
Depreciation expense	4,992	4,597	3,497
Amortization expense	30,244	25,142	12,173
Total operating expenses	438,536	439,136	367,572
Operating Income (Loss)	124,710	113,099	58,035
Other Income (Expense)
Other income (expense), net	2,411	3,289	1,635
Total other income (expense), net	8,253	(23,180)	18,161
Interest Income (Expense)
Total interest income (expense), net	7,722	19,122	4,233
Income (Loss) Before Income Taxes	140,685	109,041	80,429
Income tax expense (benefit)	35,177	32,961	40,490
Net Income (Loss)	105,508	76,080	39,939
Noncontrolling interests	(9,859)	(551)	(2,927)
Net Income (Loss) Attributable to Stockholders	95,649	75,529	37,012
Preferred stockholder dividends	(8,337)	(8,337)	(8,336)
Net Income (Loss) Attributable to Common Stockholders	$ 87,312	$ 67,192	$ 28,676
Earnings (Loss) per Share—Basic (in $ per share)	$ 12.54	$ 9.37	$ 4.09
Earnings (Loss) per Share—Diluted (in $ per share)	$ 11.74	$ 8.86	$ 3.96
Weighted Average Shares Outstanding—Basic (in shares)	6,963	7,174	7,013
Weighted Average Shares Outstanding—Diluted (in shares)	8,149	8,527	7,247
Consolidated entity excluding consolidated investment products
Operating Expenses
Other operating expenses	$ 74,363	$ 74,853	$ 69,410
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	7,044	(5,217)	2,973
Interest Income (Expense)
Interest expense	(19,473)	(19,445)	(12,007)
Interest and dividend income	3,844	4,999	2,160
Consolidated investment products
Operating Expenses
Other operating expenses	4,015	3,515	8,531
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	(1,202)	(21,252)	13,553
Interest Income (Expense)
Interest expense	(92,005)	(64,788)	(35,243)
Interest and dividend income	115,356	98,356	49,323
Total investment management fees
Revenues
Revenues	461,477	437,021	331,075
Distribution and service fees
Revenues
Revenues	40,898	50,715	44,322
Administration and shareholder service fees
Revenues
Revenues	59,884	63,614	48,996
Other income and fees
Revenues
Revenues	$ 987	$ 885	$ 1,214