Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Investment management fees	$ 60,398	$ 64,891	$ 176,234	$ 204,254
Distribution and service fees	12,116	15,587	36,761	52,820
Administration and transfer agent fees	9,588	11,614	29,085	37,233
Other income and fees	222	283	624	1,555
Total revenues	82,324	92,375	242,704	295,862
Operating Expenses
Employment expenses	33,142	33,504	102,184	102,719
Distribution and other asset-based expenses	17,380	21,717	52,913	69,900
Other operating expenses	11,392	11,165	34,614	51,403
Restructuring and severance	1,879	0	4,270	0
Depreciation and other amortization	754	910	2,392	2,562
Amortization expense	604	837	1,858	2,511
Total operating expenses	65,786	69,253	204,673	231,990
Operating Income	16,538	23,122	38,031	63,872
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	961	(2,082)	3,584	(1,194)
Other income, net	250	141	463	823
Total other income (expense), net	4,891	(20,281)	13,935	(19,363)
Interest Income (Expense)
Interest and dividend income	221	324	1,113	906
Total interest income, net	1,716	3,125	5,392	8,885
Income Before Income Taxes	23,145	5,966	57,358	53,394
Income tax expense	6,869	9,669	20,512	28,360
Net Income (Loss)	16,276	(3,703)	36,846	25,034
Noncontrolling interests	(651)	3,054	(770)	3,436
Net Income (Loss) Attributable to Common Stockholders	$ 15,625	$ (649)	$ 36,076	$ 28,470
Earnings (Loss) per share—Basic (in $ per share)	$ 2.04	$ (0.07)	$ 4.47	$ 3.21
Earnings (Loss) per Share—Diluted (in $ per share)	1.99	(0.07)	4.39	3.15
Cash Dividends Declared per Share (in $ per share)	$ 0.45	$ 0.45	$ 1.35	$ 1.35
Weighted Average Shares Outstanding—Basic (in shares)	7,676	8,775	8,062	8,876
Weighted Average Shares Outstanding—Diluted (in shares)	7,854	8,775	8,223	9,039
Parent [Member]
Interest Income (Expense)
Interest expense	$ (128)	$ (138)	$ (389)	$ (382)
Consolidated Sponsored Investment Products [Member]
Operating Expenses
Other operating expenses	611	1,120	2,521	2,895
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	3,536	(17,619)	6,928	(18,271)
Interest Income (Expense)
Interest and dividend income	1,364	2,898	6,021	8,320
Consolidated Investment Product [Member]
Revenues
Total revenues	4,191		11,795
Operating Expenses
Other operating expenses	24	0	3,921	0
Other Income (Expense)
Realized and unrealized gain (loss) on investments, net	144	(721)	2,960	(721)
Interest Income (Expense)
Interest expense	(3,788)	(1)	(10,188)	(1)
Interest and dividend income	4,047	$ 42	8,835	$ 42
Net Income (Loss) Attributable to Common Stockholders	$ 379		$ (2,314)