Summary of Significant Accounting Policies (Schedule of Other Income (Loss), Net) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
(Loss) gain on warrants	$ (369)	$ 45	$ (483)	$ (123)
Interest and dividend income	1,858	1,189	3,607	2,189
Accretion of interest income from debt discount on notes receivable	10	10	74	76
Gain on long-term investment	24	0	224	0
Out-of-period adjustment	0	0	0	1,231
Acceleration of closing fee related to termination of Douglas Elliman joint venture	0	2,335	0	2,335
Other income (expense)	2	(4)	(1)	(7)
Other income, net	$ 1,525	$ 3,575	$ 3,421	$ 5,701