Goodwill and Other Intangible Assets - Components of Goodwill and Other Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill and Intangible Assets [Roll Forward]
Goodwill, beginning balance		$ 78,008		$ 78,008
Impairment Losses		(46,262)
Goodwill, ending balance	$ 31,756			31,756
Finite-lived Intangible Assets [Roll Forward]
Intangibles with a finite life, net, beginning balance		474		474
Impairment Losses				0
Amortization				(82)
Intangibles with a finite life, net, ending balance	392			392
Goodwill and Intangible Assets [Roll Forward]
Goodwill and other intangible assets, net, beginning balance		265,993		265,993
Impairments of goodwill and intangible assets	0		$ 0	58,252	$ 0
Amortization				(82)
Goodwill and other intangible assets, net, ending balance	207,659			207,659
Intangible asset associated with benefit under the MSA
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite life intangibles, beginning balance		107,511		107,511
Impairment Losses				0
Indefinite life intangibles, ending balance	107,511			107,511
Trademark - Douglas Elliman
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite life intangibles, beginning balance		80,000		80,000
Impairment Losses		$ 12,000		(12,000)
Indefinite life intangibles, ending balance	$ 68,000			$ 68,000