CONDENSED CONSOLIDATED STATEMENTS OF EQUITY UNAUDITED - USD ($) $ in Thousands	Noncontrolling Interests [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Comprehensive Income [Member]	Treasury Stock [Member]	Total	Redeemable Noncontrolling Interests [Member]
Balance at Dec. 31, 2013	$ 2,851	$ 33	$ 282,496	$ 506,441	$ 30,239	$ (361,878)	$ 460,182	$ 6,751
Redemptions of redeemable noncontrolling interests	0	0	0	0	0	0	0	(1,666)
Contributions from redeemable noncontrolling interests	0	0	0	0	0	0	0	53,607
Net income	(112)	0	0	80,569	0	0	80,457	(2,606)
Net unrealized gains on securities available for sale, net of tax	0	0	0	0	(2,371)	0	(2,371)	0
Amount reclassed out of accumulated other comprehensve income, net of income tax benefit	0	0	0	0	(4,461)	0	(4,461)	0
Foreign currency translation	0	0	0	0	(15)	0	(15)	0
Dividends declared	0	0	0	(4,653)	0	0	(4,653)	0
Stock based compensation expense	0	0	5,182	0	0	0	5,182	0
Exercise of stock options including tax benefit	0	0	1,986	0	0	0	1,986	0
Purchase of treasury stock	0	0	0	0	0	(25,074)	(25,074)	0
Balance at Sep. 30, 2014	2,739	33	289,664	582,357	23,392	(386,952)	511,233	56,086
Balance at Dec. 31, 2014	2,734	33	291,681	602,950	25,014	(394,617)	527,795	68,334
Redemptions of redeemable noncontrolling interests	0	0	0	0	0	0	0	(600)
Contributions from redeemable noncontrolling interests	0	0	0	0	0	0	0	1,036
Noncontrolling Interest, Increase from Consolidation of Consolidated Feeder Fund	0	0	0	0	0	0	0	996
Noncontrolling Interest, Decrease from Deconsolidation of Offshore Fund	0	0	0	0	0	0	0	(63,256)
Net income	(99)	0	0	63,846	0	0	63,747	(490)
Net unrealized gains on securities available for sale, net of tax	0	0	0	0	(7,392)	0	(7,392)	0
Amount reclassed out of accumulated other comprehensve income, net of income tax benefit	0	0	0	0	(25)	0	(25)	0
Foreign currency translation	0	0	0	0	(22)	0	(22)	0
Dividends declared	0	0	0	(5,381)	0	0	(5,381)	0
Stock based compensation expense	0	0	6,819	0	0	0	6,819	0
Exercise of stock options including tax benefit	0	0	1,269	0	0	0	1,269	0
Purchase of treasury stock	0	0	0	0	0	(21,530)	(21,530)	0
Balance at Sep. 30, 2015	$ 2,635	$ 33	$ 299,769	$ 661,415	$ 17,575	$ (416,147)	$ 565,280	$ 6,020