Summary of Significant Accounting Policies (Schedule of Other, Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Interest and dividend income	$ 6,018	$ 7,038	$ 5,803
Out-of-period adjustment	0	0	1,231
Acceleration of closing fee related to termination of Douglas Elliman joint venture	0	0	2,335
Impairment of real estate, net	0	(230)	0
Loss on sale of assets	0	(78)	0
Gain on long-term investment	190	390	0
Impairment of long-term investments	(1,203)	(811)	0
Other (expense) income	(273)	100	27
Other, net	$ 4,732	$ 6,409	$ 9,396