Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands	Total	Class A Common Stock	Class B Common Stock	Class C Common Stock	Additional Paid-in Capital	Accumulated (Deficit)	Stockholders' Equity	Non-controlling Interests in Holdings	Non-controlling Interests in the Consolidated Investment Products
Balance at Dec. 31, 2009	$ 3,981	$ 28	$ 15	$ 168	$ 586,956	$ (580,275)	$ 6,892	$ (2,911)	$ 0
Net income	56,306					37,823	37,823	18,483
Holdings units exchanged for Class A common stock and cancelation of Class B common stock		14	(14)		3,253		3,253	(3,253)
Net benefit from step-up in tax basis	24,181				24,181		24,181
Shares issued to the public	69,290	4			69,286		69,290
Stock repurchases	(69,290)	(4)			(69,286)		(69,290)
Share-based payments:
Directors' awards	180				180		180
Amortization	6,517				6,517		6,517
Forfeiture	(61)				(61)		(61)
RSU dividend equivalents					273	(273)
Distribution to non-controlling interests	(11,826)							(11,826)
Cash dividends paid	(5,339)					(5,339)	(5,339)
Balance at Jun. 30, 2010	73,939	42	1	168	621,299	(548,064)	73,446	493	0
Balance at Dec. 31, 2010	106,283	42	1	168	613,065	(509,629)	103,647	1,505	1,131
Net income	44,730					43,182	43,182	1,488	60
Share-based payments:
Directors' awards	311				311		311
Amortization	9,096				9,096		9,096
Forfeiture	(1)				(1)		(1)
RSU dividend equivalents					517	(517)
Capital contributions from non-controlling interests	11,265								11,265
Distribution to non-controlling interests	(1,361)							(1,361)
Cash dividends paid	(7,006)					(7,006)	(7,006)
Balance at Jun. 30, 2011	$ 163,317	$ 42	$ 1	$ 168	$ 622,988	$ (473,970)	$ 149,229	$ 1,632	$ 12,456