Summary of Significant Accounting Policies (Goodwill and Other Intangible Assets, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 77,059	$ 70,815
Intangibles with a finite life, net	3,609	3,592
Total goodwill and other intangible assets, net	268,179	261,918
Intangible asset associated with benefit under the MSA
Indefinite-lived Intangible Assets [Line Items]
Indefinite life intangibles:	107,511	107,511
Trademark - Douglas Elliman
Indefinite-lived Intangible Assets [Line Items]
Indefinite life intangibles:	$ 80,000	$ 80,000