CONDENSED CONSOLIDATED STATEMENTS OF EQUITY UNAUDITED - USD ($) $ in Thousands	Noncontrolling Interests [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total	Redeemable Noncontrolling Interests [Member]
Balance at Dec. 31, 2014	$ 2,734	$ 33	$ 291,681	$ 602,950	$ 25,014	$ (394,617)	$ 527,795	$ 68,334
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemptions of redeemable noncontrolling interests	0	0	0	0	0	0	0	(441)
Consolidation of a consolidated feeder fund	0	0	0	0	0	0	0	891
Deconsolidation of offshore fund	0	0	0	0	0	0	0	(63,256)
Net income (loss)	(8)	0	0	24,776	0	0	24,768	(9)
Net unrealized losses on securities available for sale, net of income tax	0	0	0	0	(451)	0	(451)	0
Amounts reclassified from accumulated other comprehensve income, net of income tax benefit	0	0	0	0	(16)	0	(16)	0
Foreign currency translation	0	0	0	0	(42)	0	(42)	0
Dividends declared	0	0	0	(1,800)	0	0	(1,800)	0
Stock based compensation expense	0	0	2,277	0	0	0	2,277	0
Purchase of treasury stock	0	0	0	0	0	(3,196)	(3,196)	0
Balance at Mar. 31, 2015	$ 2,726	33	293,958	625,926	24,505	(397,813)	549,335	$ 5,519
Balance at Dec. 31, 2015		33	345	(34,224)	9,115	(251,596)	(276,327)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		0	0	26,025	0	0	26,025
Net unrealized losses on securities available for sale, net of income tax		0	0	0	2,582	0	2,582
Amounts reclassified from accumulated other comprehensve income, net of income tax benefit		0	0	0	1	0	1
Foreign currency translation		0	0	0	(28)	0	(28)
Dividends declared		0	0	(595)	0	0	(595)
Stock based compensation expense		0	1,037	0	0	0	1,037
Purchase of treasury stock		0	0	0	0	(898)	(898)
Balance at Mar. 31, 2016		$ 33	$ 1,382	$ (8,794)	$ 11,670	$ (252,494)	$ (248,203)