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Summary of Significant Accounting Policies (Goodwill and Other Intangible Assets, Net) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items]    
Goodwill $ 78,008 $ 77,568
Intangibles with a finite life, net 515 1,532
Total goodwill and other intangible assets, net 266,034 266,611
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