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Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets:      
Investment securities available for sale $ 131,569    
Total 683,605    
Long-term investments, fair value 54,628 $ 0  
Equity securities at fair value that qualify for the NAV practical expedient 54,628 0  
Liabilities:      
Contingent consideration liability 6,304    
Fair value of derivatives embedded within convertible debt 31,424    
Fair value of derivatives embedded within convertible debt 24,789 76,413  
Total 37,728    
Long-term investments 66,259 81,291  
Impairment of long-term investments $ 0 (50) $ (385)
Douglas Elliman      
Liabilities:      
Voting interest acquired 29.41%    
5.5% Variable Interest Senior Convertible Notes due 2020 | Variable Interest Senior Convertible Debt      
Liabilities:      
Fair value of derivatives embedded within convertible debt $ 24,789 45,249  
Interest rate 5.50%    
Marketable equity securities      
Assets:      
Investment securities available for sale $ 26,010    
Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale 21,192    
Equity securities      
Assets:      
Investment securities available for sale 47,202    
U.S. Government securities      
Assets:      
Investment securities available for sale 28,514    
Corporate securities      
Assets:      
Investment securities available for sale 41,733    
U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale 4,369    
Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale 401    
Commercial paper      
Assets:      
Investment securities available for sale 5,870    
Index-linked U.S. bonds      
Assets:      
Investment securities available for sale 2,330    
Foreign fixed-income securities      
Assets:      
Investment securities available for sale 1,150    
Fixed income securities      
Assets:      
Investment securities available for sale 84,367    
Money market funds      
Assets:      
Cash and cash equivalents 448,560    
Commercial paper      
Assets:      
Cash and cash equivalents 46,062    
Certificates of deposit      
Assets:      
Cash and cash equivalents 2,251    
Bonds      
Assets:      
Cash and cash equivalents 535    
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets:      
Investment securities available for sale 47,202    
Total 496,297    
Equity securities at fair value that qualify for the NAV practical expedient 0    
Liabilities:      
Contingent consideration liability 0    
Fair value of derivatives embedded within convertible debt 0    
Total 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities      
Assets:      
Investment securities available for sale 26,010    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale 21,192    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities      
Assets:      
Investment securities available for sale 47,202    
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income securities      
Assets:      
Investment securities available for sale 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds      
Assets:      
Cash and cash equivalents 448,560    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper      
Assets:      
Cash and cash equivalents 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit      
Assets:      
Cash and cash equivalents 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Bonds      
Assets:      
Cash and cash equivalents 535    
Significant Other Observable Inputs (Level 2)      
Assets:      
Investment securities available for sale 84,367    
Total 132,680    
Equity securities at fair value that qualify for the NAV practical expedient 0    
Liabilities:      
Contingent consideration liability 0    
Fair value of derivatives embedded within convertible debt 0    
Total 0    
Significant Other Observable Inputs (Level 2) | Marketable equity securities      
Assets:      
Investment securities available for sale 0    
Significant Other Observable Inputs (Level 2) | Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale 0    
Significant Other Observable Inputs (Level 2) | Equity securities      
Assets:      
Investment securities available for sale 0    
Significant Other Observable Inputs (Level 2) | U.S. Government securities      
Assets:      
Investment securities available for sale 28,514    
Significant Other Observable Inputs (Level 2) | Corporate securities      
Assets:      
Investment securities available for sale 41,733    
Significant Other Observable Inputs (Level 2) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale 4,369    
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale 401    
Significant Other Observable Inputs (Level 2) | Commercial paper      
Assets:      
Investment securities available for sale 5,870    
Significant Other Observable Inputs (Level 2) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale 2,330    
Significant Other Observable Inputs (Level 2) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale 1,150    
Significant Other Observable Inputs (Level 2) | Fixed income securities      
Assets:      
Investment securities available for sale 84,367    
Significant Other Observable Inputs (Level 2) | Money market funds      
Assets:      
Cash and cash equivalents 0    
Significant Other Observable Inputs (Level 2) | Commercial paper      
Assets:      
Cash and cash equivalents 46,062    
Significant Other Observable Inputs (Level 2) | Certificates of deposit      
Assets:      
Cash and cash equivalents 2,251    
Significant Other Observable Inputs (Level 2) | Bonds      
Assets:      
Cash and cash equivalents 0    
Significant Unobservable Inputs (Level 3)      
Assets:      
Investment securities available for sale 0    
Total 0    
Equity securities at fair value that qualify for the NAV practical expedient 0    
Liabilities:      
Contingent consideration liability 6,304    
Fair value of derivatives embedded within convertible debt 31,424    
Total 37,728    
Significant Unobservable Inputs (Level 3) | Marketable equity securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Equity securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | U.S. Government securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Corporate securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Commercial paper      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Fixed income securities      
Assets:      
Investment securities available for sale 0    
Significant Unobservable Inputs (Level 3) | Money market funds      
Assets:      
Cash and cash equivalents 0    
Significant Unobservable Inputs (Level 3) | Commercial paper      
Assets:      
Cash and cash equivalents 0    
Significant Unobservable Inputs (Level 3) | Certificates of deposit      
Assets:      
Cash and cash equivalents 0    
Significant Unobservable Inputs (Level 3) | Bonds      
Assets:      
Cash and cash equivalents 0    
Fair Value, Measurements, Recurring      
Assets:      
Investment securities available for sale   150,489  
Total   366,672  
Liabilities:      
Fair value of derivatives embedded within convertible debt   76,413  
Fair Value, Measurements, Recurring | Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale   21,041  
Fair Value, Measurements, Recurring | Equity securities      
Assets:      
Investment securities available for sale   44,634  
Fair Value, Measurements, Recurring | U.S. Government securities      
Assets:      
Investment securities available for sale   28,502  
Fair Value, Measurements, Recurring | Corporate securities      
Assets:      
Investment securities available for sale   41,329  
Fair Value, Measurements, Recurring | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   4,564  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   426  
Fair Value, Measurements, Recurring | Commercial paper      
Assets:      
Investment securities available for sale   7,027  
Fair Value, Measurements, Recurring | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   2,316  
Fair Value, Measurements, Recurring | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   650  
Fair Value, Measurements, Recurring | Fixed income securities      
Assets:      
Investment securities available for sale   84,814  
Fair Value, Measurements, Recurring | Money market funds      
Assets:      
Cash and cash equivalents   166,915  
Fair Value, Measurements, Recurring | Commercial paper      
Assets:      
Cash and cash equivalents   43,781  
Fair Value, Measurements, Recurring | Certificates of deposit      
Assets:      
Cash and cash equivalents   2,497  
Fair Value, Measurements, Recurring | Bonds      
Assets:      
Cash and cash equivalents   2,990  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets:      
Investment securities available for sale   65,675  
Total   235,580  
Liabilities:      
Fair value of derivatives embedded within convertible debt   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale   21,041  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities      
Assets:      
Investment securities available for sale   44,634  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds      
Assets:      
Cash and cash equivalents   166,915  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Bonds      
Assets:      
Cash and cash equivalents   2,990  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)      
Assets:      
Investment securities available for sale   84,814  
Total   131,092  
Liabilities:      
Fair value of derivatives embedded within convertible debt   0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government securities      
Assets:      
Investment securities available for sale   28,502  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities      
Assets:      
Investment securities available for sale   41,329  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   4,564  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   426  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper      
Assets:      
Investment securities available for sale   7,027  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   2,316  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   650  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Fixed income securities      
Assets:      
Investment securities available for sale   84,814  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper      
Assets:      
Cash and cash equivalents   43,781  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit      
Assets:      
Cash and cash equivalents   2,497  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Bonds      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)      
Assets:      
Investment securities available for sale   0  
Total   0  
Liabilities:      
Fair value of derivatives embedded within convertible debt   76,413  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds invested in fixed income securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed income securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Money market funds      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Certificates of deposit      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Bonds      
Assets:      
Cash and cash equivalents   0  
Fair Value, Measurements, Nonrecurring      
Assets:      
Total   4,475  
Long-term investments, fair value   4,475  
Liabilities:      
Gain (loss) on long-term investments   (525)  
Gain (loss) on long-term investments and real estate held for sale   (525)  
Long-term investments   5,000  
Impairment of long-term investments   (525)  
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)      
Assets:      
Total   4,475  
Long-term investments, fair value   $ 4,475  
Current Restricted Assets | Fair Value, Measurements, Recurring | Commercial paper      
Assets:      
Cash and cash equivalents 2,570    
Restricted Assets | Fair Value, Measurements, Recurring | Commercial paper      
Assets:      
Cash and cash equivalents $ 3,910