Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues
Investment management fees	$ 187,875	$ 135,063	$ 97,996
Distribution and service fees	56,866	43,792	29,572
Administration and transfer agent fees	33,779	23,878	15,324
Other income and fees	1,566	1,919	1,664
Total revenues	280,086	204,652	144,556
Operating Expenses
Employment expenses	105,571	92,543	65,234
Distribution and administration expenses	72,210	60,176	33,205
Other operating expenses	34,017	30,157	28,282
Other operating expenses of consolidated sponsored investment products	315
Restructuring and severance	1,597	2,008	1,635
Depreciation and other amortization	1,810	1,847	2,007
Amortization expense	4,121	4,018	4,922
Total operating expenses	219,641	190,749	135,285
Operating Income	60,445	13,903	9,271
Other Income (Expense)
Realized and unrealized gain (loss) on trading securities, net	1,891	(256)	1,131
Realized and unrealized gain on investments of consolidated sponsored investment products, net	2,072
Other (expense) income, net	(38)	(194)	77
Total other income (expense), net	3,925	(450)	1,208
Interest Income (Expense)
Interest expense	(854)	(782)	(983)
Interest and dividend income	710	321	659
Interest and dividend income of investments of consolidated sponsored investment products	577	0	0
Total interest income (expense), net	433	(461)	(324)
Income Before Income Taxes	64,803	12,992	10,155
Income tax expense (benefit)	27,030	(132,428)	513
Net Income	37,773	145,420	9,642
Noncontrolling interests	(101)
Preferred stockholder dividends		(9,482)	(3,289)
Allocation of earnings to preferred stockholders	(64)	(24,260)	(1,144)
Net Income Attributable to Common Stockholders	$ 37,608	$ 111,678	$ 5,209
Earnings (Loss) per share - Basic	$ 4.87	$ 17.98	$ 0.87
Earnings (Loss) per share - Diluted	$ 4.66	$ 16.34	$ 0.81
Weighted Average Shares Outstanding - Basic (in thousands)	7,727	6,211	6,014
Weighted Average Shares Outstanding - Diluted (in thousands)	8,073	6,834	6,437