Summary of Significant Accounting Policies (Goodwill and Other Intangible Assets, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 77,568	$ 77,059
Intangibles with a finite life, net	1,954	3,138
Total goodwill and other intangible assets, net	267,033	267,708
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

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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