Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Investment management fees	$ 57,644	$ 70,496
Distribution and service fees	12,478	19,598
Administration and transfer agent fees	9,998	13,042
Other income and fees	175	695
Total revenues	80,295	103,831
Operating Expenses
Employment expenses	35,977	35,622
Distribution and other asset-based expenses	18,101	24,507
Other operating expenses	10,765	16,726
Depreciation and other amortization	862	779
Amortization expense	651	837
Total operating expenses	67,545	79,289
Operating Income	12,750	24,542
Other Income (Expense)
Realized and unrealized (loss) gain on investments, net	(658)	545
Other income, net	228	435
Total other income, net	2,100	3,570
Interest Income (Expense)
Interest expense	(132)	(123)
Interest and dividend income	273	280
Total interest income, net	4,576	2,481
Income Before Income Taxes	19,426	30,593
Income tax expense	7,556	10,868
Net Income	11,870	19,725
Noncontrolling interests	493	(383)
Net Income Attributable to Common Stockholders	$ 12,363	$ 19,342
Earnings per share—Basic (in $ per share)	$ 1.48	$ 2.16
Earnings per Share—Diluted (in $ per share)	1.45	2.11
Cash Dividends Declared per Share (in $ per share)	$ 0.45	$ 0.45
Weighted Average Shares Outstanding—Basic (in shares)	8,344	8,964
Weighted Average Shares Outstanding—Diluted (in shares)	8,506	9,151
Consolidated Sponsored Investment Products [Member]
Operating Expenses
Other operating expenses	$ 1,133	$ 818
Other Income (Expense)
Realized and unrealized (loss) gain on investments, net	295	2,590
Interest Income (Expense)
Interest and dividend income	2,961	2,324
Consolidated Investment Product [Member]
Operating Expenses
Other operating expenses	56	0
Other Income (Expense)
Realized and unrealized (loss) gain on investments, net	2,235	0
Interest Income (Expense)
Interest and dividend income	$ 1,474	$ 0