Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Revenues	$ 552,235	$ 425,607	$ 322,554
Operating Expenses
Employment expenses	238,501	191,394	135,641
Distribution and other asset-based expenses	92,441	71,987	69,049
Restructuring and severance	87	10,580	4,270
Depreciation and other amortization	4,597	3,497	3,092
Amortization expense	25,142	12,173	2,461
Total operating expenses	439,136	367,572	271,740
Operating Income (Loss)	113,099	58,035	50,814
Other Income (Expense)
Other income (expense), net	3,289	1,635	1,089
Total other income (expense), net	(23,180)	18,161	8,819
Interest Income (Expense)
Total interest income (expense), net	19,122	4,233	10,174
Income (Loss) Before Income Taxes	109,041	80,429	69,807
Income tax expense (benefit)	32,961	40,490	21,044
Net Income (Loss)	76,080	39,939	48,763
Noncontrolling interests	(551)	(2,927)	(261)
Net Income (Loss) Attributable to Stockholders	75,529	37,012	48,502
Preferred stockholder dividends	(8,337)	(8,336)	0
Net Income (Loss) Attributable to Common Stockholders	$ 67,192	$ 28,676	$ 48,502
Earnings (Loss) per Share—Basic (in $ per share)	$ 9.37	$ 4.09	$ 6.34
Earnings (Loss) per Share—Diluted (in $ per share)	8.86	3.96	6.20
Cash dividends declared per preferred share (in $ per share)	7.25	7.25	0
Cash dividends declared per common share (in $ per share)	$ 2	$ 1.80	$ 1.8
Weighted Average Shares Outstanding—Basic (in shares)	7,174	7,013	7,648
Weighted Average Shares Outstanding—Diluted (in shares)	8,527	7,247	7,822
Consolidated entity excluding consolidated investment products
Operating Expenses
Other operating expenses	$ 74,853	$ 69,410	$ 50,274
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	(5,217)	2,973	4,982
Interest Income (Expense)
Interest expense	(19,445)	(12,007)	(679)
Interest and dividend income	4,999	2,160	1,743
Consolidated investment products
Operating Expenses
Other operating expenses	3,515	8,531	6,953
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	(21,252)	13,553	2,748
Interest Income (Expense)
Interest expense	(64,788)	(35,243)	(11,292)
Interest and dividend income	98,356	49,323	20,402
Total investment management fees
Revenues
Revenues	437,021	331,075	235,230
Distribution and service fees
Revenues
Revenues	50,715	44,322	48,250
Administration and shareholder service fees
Revenues
Revenues	63,614	48,996	38,261
Other income and fees
Revenues
Revenues	$ 885	$ 1,214	$ 813