Investments and Fair Value Measurements (Quantitative Information about Level 3 Fair Value Measurements) (Details)	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt	$ 24,789,000	$ 76,413,000
Contingent consideration liability	6,304,000
Nonrecurring nonfinancial assets	0	0
Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liability	6,304,000
Estimated fair value of the Douglas Elliman reporting unit	320,000,000
Significant Unobservable Inputs (Level 3) \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt	$ 31,424,000	$ 76,413,000
Assumed annual stock dividend \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.05	0.05
Assumed annual cash dividend \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| $ / shares	1.60	1.60
Stock price \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| $ / shares	9.73	22.38
Convertible trading price (as a percentage of par value) \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1.0031	1.1519
Volatility \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.2039	0.1798
Risk-free rate \| Significant Unobservable Inputs (Level 3) \| Monte Carlo simulation model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0245
Implied credit spread \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.085	0.035
Implied credit spread \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.080	0.030
Implied credit spread \| Significant Unobservable Inputs (Level 3) \| Discounted cash flow \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.090	0.040
Leverage-adjusted equity volatility of peer firms \| Significant Unobservable Inputs (Level 3) \| Monte Carlo simulation model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.3022

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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