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Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Assets:    
Investment securities available for sale $ 140,690,000  
Equity securities at fair value 46,123,000 $ 47,202,000
Equity securities at fair value that qualify for the NAV practical expedient 52,384,000 54,628,000
Total 490,385,000 683,605,000
Liabilities:    
Fair value of contingent liability 5,204,000 6,304,000
Fair value of derivatives embedded within convertible debt 11,105,000 31,424,000
Total 16,309,000 37,728,000
Nonrecurring nonfinancial assets subject to fair value measurements $ 0 0
5.5% Variable Interest Senior Convertible Debentures due 2020 | Variable Interest Senior Convertible Debt    
Liabilities:    
Interest rate 5.50%  
Marketable equity securities    
Assets:    
Investment securities available for sale $ 23,909,000 26,010,000
Mutual funds invested in fixed-income securities    
Assets:    
Investment securities available for sale 22,214,000 21,192,000
Equity Securities [Member]    
Assets:    
Investment securities available for sale 46,123,000 47,202,000
U.S. Government securities    
Assets:    
Investment securities available for sale 17,543,000  
Corporate securities    
Assets:    
Investment securities available for sale 50,159,000  
U.S. mortgage-backed securities    
Assets:    
Investment securities available for sale 10,361,000  
Commercial mortgage-backed securities    
Assets:    
Investment securities available for sale 388,000  
Index-linked U.S. bonds    
Assets:    
Investment securities available for sale 1,174,000  
Foreign fixed-income securities    
Assets:    
Investment securities available for sale 1,008,000  
Total debt securities available for sale    
Assets:    
Investment securities available for sale 94,567,000  
Money market funds    
Assets:    
Cash and cash equivalents 255,579,000  
Commercial paper    
Assets:    
Cash and cash equivalents 39,011,000  
Certificates of deposit    
Assets:    
Cash and cash equivalents 2,186,000  
Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents 535,000  
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Investment securities available for sale 46,123,000  
Equity securities at fair value that qualify for the NAV practical expedient 0 0
Total 302,237,000 496,297,000
Liabilities:    
Fair value of contingent liability 0 0
Fair value of derivatives embedded within convertible debt 0 0
Total 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities    
Assets:    
Investment securities available for sale   26,010,000
Equity securities at fair value 23,909,000 26,010,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds invested in fixed-income securities    
Assets:    
Investment securities available for sale   21,192,000
Equity securities at fair value 22,214,000 21,192,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities [Member]    
Assets:    
Investment securities available for sale 46,123,000 47,202,000
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 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) | Total debt securities available for sale    
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 255,579,000  
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) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents 535,000  
Significant Other Observable Inputs (Level 2)    
Assets:    
Investment securities available for sale 94,567,000  
Equity securities at fair value that qualify for the NAV practical expedient 0 0
Total 135,764,000 132,680,000
Liabilities:    
Fair value of contingent liability 0 0
Fair value of derivatives embedded within convertible debt 0 0
Total 0 0
Significant Other Observable Inputs (Level 2) | Marketable equity securities    
Assets:    
Investment securities available for sale 0 0
Significant Other Observable Inputs (Level 2) | Mutual funds invested in fixed-income securities    
Assets:    
Investment securities available for sale 0 0
Significant Other Observable Inputs (Level 2) | Equity Securities [Member]    
Assets:    
Investment securities available for sale 0 0
Significant Other Observable Inputs (Level 2) | U.S. Government securities    
Assets:    
Investment securities available for sale 17,543,000  
Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets:    
Investment securities available for sale 50,159,000  
Significant Other Observable Inputs (Level 2) | U.S. mortgage-backed securities    
Assets:    
Investment securities available for sale 10,361,000  
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities    
Assets:    
Investment securities available for sale 388,000  
Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Investment securities available for sale 13,934,000 5,870,000
Significant Other Observable Inputs (Level 2) | Index-linked U.S. bonds    
Assets:    
Investment securities available for sale 1,174,000  
Significant Other Observable Inputs (Level 2) | Foreign fixed-income securities    
Assets:    
Investment securities available for sale 1,008,000  
Significant Other Observable Inputs (Level 2) | Total debt securities available for sale    
Assets:    
Investment securities available for sale 94,567,000  
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 39,011,000  
Significant Other Observable Inputs (Level 2) | Certificates of deposit    
Assets:    
Cash and cash equivalents 2,186,000  
Significant Other Observable Inputs (Level 2) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents 0  
Significant Unobservable Inputs (Level 3)    
Assets:    
Investment securities available for sale 0  
Equity securities at fair value that qualify for the NAV practical expedient 0 0
Total 0 0
Liabilities:    
Fair value of contingent liability 5,204,000 6,304,000
Fair value of derivatives embedded within convertible debt 11,105,000 31,424,000
Total 16,309,000 37,728,000
Significant Unobservable Inputs (Level 3) | Marketable equity securities    
Assets:    
Investment securities available for sale 0 0
Significant Unobservable Inputs (Level 3) | Mutual funds invested in fixed-income securities    
Assets:    
Investment securities available for sale 0 0
Significant Unobservable Inputs (Level 3) | Equity Securities [Member]    
Assets:    
Investment securities available for sale 0 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 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) | Total debt securities available for sale    
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) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents 0  
Fair Value, Measurements, Recurring    
Assets:    
Investment securities available for sale   131,569,000
Fair Value, Measurements, Recurring | U.S. Government securities    
Assets:    
Investment securities available for sale   28,514,000
Fair Value, Measurements, Recurring | Corporate securities    
Assets:    
Investment securities available for sale   41,733,000
Fair Value, Measurements, Recurring | U.S. mortgage-backed securities    
Assets:    
Investment securities available for sale   4,369,000
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities    
Assets:    
Investment securities available for sale   401,000
Fair Value, Measurements, Recurring | Commercial paper    
Assets:    
Investment securities available for sale 13,934,000 5,870,000
Fair Value, Measurements, Recurring | Index-linked U.S. bonds    
Assets:    
Investment securities available for sale   2,330,000
Fair Value, Measurements, Recurring | Foreign fixed-income securities    
Assets:    
Investment securities available for sale   1,150,000
Fair Value, Measurements, Recurring | Total debt securities available for sale    
Assets:    
Investment securities available for sale   84,367,000
Fair Value, Measurements, Recurring | Money market funds    
Assets:    
Cash and cash equivalents   448,560,000
Fair Value, Measurements, Recurring | Commercial paper    
Assets:    
Cash and cash equivalents   46,062,000
Fair Value, Measurements, Recurring | Commercial paper | Current Restricted Assets    
Assets:    
Cash and cash equivalents 3,660,000 2,570,000
Fair Value, Measurements, Recurring | Commercial paper | Restricted Assets    
Assets:    
Cash and cash equivalents $ 3,910,000 3,910,000
Fair Value, Measurements, Recurring | Certificates of deposit    
Assets:    
Cash and cash equivalents   2,251,000
Fair Value, Measurements, Recurring | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents   535,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Investment securities available for sale   47,202,000
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) | 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) | Total debt securities available for sale    
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   448,560,000
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) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents   535,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Investment securities available for sale   84,367,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government securities    
Assets:    
Investment securities available for sale   28,514,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets:    
Investment securities available for sale   41,733,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. mortgage-backed securities    
Assets:    
Investment securities available for sale   4,369,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities    
Assets:    
Investment securities available for sale   401,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Index-linked U.S. bonds    
Assets:    
Investment securities available for sale   2,330,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign fixed-income securities    
Assets:    
Investment securities available for sale   1,150,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Total debt securities available for sale    
Assets:    
Investment securities available for sale   84,367,000
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   46,062,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit    
Assets:    
Cash and cash equivalents   2,251,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents   0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
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) | 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) | Total debt securities available for sale    
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) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents   $ 0
Douglas Elliman    
Liabilities:    
Percent of voting interest acquired 29.41%