Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Investment management fees	$ 331,075	$ 235,230	$ 264,865
Distribution and service fees	44,322	48,250	67,066
Administration and shareholder service fees	48,996	38,261	48,247
Other income and fees	1,214	813	1,799
Total revenues	425,607	322,554	381,977
Operating Expenses
Employment expenses	191,394	135,641	137,095
Distribution and other asset-based expenses	71,987	69,049	89,731
Restructuring and severance	10,580	4,270	0
Depreciation and other amortization	3,497	3,092	3,443
Amortization expense	12,173	2,461	3,295
Total operating expenses	367,572	271,740	301,599
Operating Income (Loss)	58,035	50,814	80,378
Other Income (Expense)
Other income (expense), net	1,635	1,089	898
Total other income (expense), net	18,161	8,819	(26,650)
Interest Income (Expense)
Total interest income (expense), net	4,233	10,174	13,915
Income (Loss) Before Income Taxes	80,429	69,807	67,643
Income tax expense (benefit)	40,490	21,044	36,972
Net Income (Loss)	39,939	48,763	30,671
Noncontrolling interests	(2,927)	(261)	4,435
Net Income (Loss) Attributable to Stockholders	37,012	48,502	35,106
Preferred stockholder dividends	(8,336)	0	0
Net Income (Loss) Attributable to Common Stockholders	$ 28,676	$ 48,502	$ 35,106
Earnings per share—Basic (in $ per share)	$ 4.09	$ 6.34	$ 3.99
Earnings per Share—Diluted (in $ per share)	3.96	6.20	3.92
Cash dividends declared per preferred share (in $ per share)	7.25	0	0
Cash dividends declared per common share (in $ per share)	$ 1.80	$ 1.8	$ 1.8
Weighted Average Shares Outstanding—Basic (in shares)	7,013	7,648	8,797
Weighted Average Shares Outstanding—Diluted (in shares)	7,247	7,822	8,960
Consolidated entity excluding consolidated investment products
Operating Expenses
Other operating expenses	$ 69,410	$ 50,274	$ 63,901
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	2,973	4,982	(862)
Interest Income (Expense)
Interest expense	(12,007)	(679)	(523)
Interest and dividend income	2,160	1,743	1,261
Consolidated investment products
Operating Expenses
Other operating expenses	8,531	6,953	4,134
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	13,553	2,748	(26,686)
Interest Income (Expense)
Interest expense	(35,243)	(11,292)	(484)
Interest and dividend income	$ 49,323	$ 20,402	$ 13,661