Summary of Significant Accounting Policies (Schedule of Other Income (Loss), Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
(Loss) gain on warrants	$ (1,282)	$ 991	$ (1,765)	$ 868
Interest and dividend income	1,578	1,476	5,185	3,665
Accretion of interest income from debt discount on notes receivable	5	11	79	87
Provision for loss on real estate held for sale	137	0	361	0
Out-of-period adjustment	0	0	0	1,231
Acceleration of closing fee related to termination of Douglas Elliman joint venture	0	0	0	2,335
Provision for loss on real estate held for sale	(229)	0	(229)	0
Loss on sale of assets	(75)	0	(75)	0
Other expense	(1)	(12)	(2)	(19)
Other income, net	$ 133	$ 2,466	$ 3,554	$ 8,167