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Investments and Fair Value Measurements (Quantitative Information about Level 3 Fair Value Measurements) (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of contingent liability $ 1,317 $ 3,147
Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of contingent liability 1,317 3,147
Estimated fair value of the Douglas Elliman reporting unit $ 169,000  
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   $ 4,999
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
Discounted cash flow | Significant Unobservable Inputs (Level 3) | Assumed remaining cash dividends - Q4 2019 and Q1 2020    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of derivatives embedded within convertible debt, measurement input | $ / shares 0.20 0.40
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   13.39
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   1.0394
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   0.3694
Estimated fair value of the Douglas Elliman reporting unit   $ 271,500
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 0.068 0.020
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 0.078 0.010
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 0.058 0.030
Monte Carlo Simulation Model | Significant Unobservable Inputs (Level 3) | Risk-free rate for a 3-year term    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of contingent liability, measurement input 0.0017 0.0161
Monte Carlo Simulation Model | 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 0.6478 0.3556