Summary of Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Interest and dividend income	$ 7,038	$ 5,803	$ 4,381
Out-of-period adjustment	0	1,231	0
Acceleration of closing fee related to termination of Douglas Elliman joint venture	0	2,335	0
Impairment of real estate held for sale	(230)	0	0
Loss on sale of assets	(78)	0	0
Gain on long-term investment	390	0	189
Impairment of Long Term Investments	(811)	0	0
Other income	100	27	3
Other income, net	$ 6,409	$ 9,396	$ 4,573