Investments and Fair Value Measurements (Quantitative Information about Level 3 Fair Value Measurements) (Details) $ in Thousands	Jun. 30, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt	$ 0	$ 24,789
Fair value of contingent liability	6,195	6,304
Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of contingent liability	6,195	6,304
Estimated fair value of the Douglas Elliman reporting unit	320,000	320,000
Discounted cash flow \| Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt	$ 17,287	$ 31,424
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Assumed annual stock dividend
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input	0.05	0.05
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Assumed annual cash dividend
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input \| $ / shares	1.60	1.60
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Stock price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input \| $ / shares	9.75	9.73
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Convertible trading price (as a percentage of par value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input	1.0306	1.0031
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input	0.3311	0.2039
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Implied credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input	0.0625	0.085
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Implied credit spread \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input	0.0525	0.080
Discounted cash flow \| Significant Unobservable Inputs (Level 3) \| Implied credit spread \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of derivatives embedded within convertible debt, measurement input	0.0725	0.090
Monte Carlo Simulation Model [Member] \| Significant Unobservable Inputs (Level 3) \| Risk-free rate for a 4-year term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of contingent liability, measurement input	0.0171	0.0245
Monte Carlo Simulation Model [Member] \| Significant Unobservable Inputs (Level 3) \| Leverage-adjusted equity volatility of peer firms
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of contingent liability, measurement input	0.2624	0.3022

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

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-Name Accounting Standards Codification
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