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Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Assets:    
Debt securities available for sale $ 103,906 $ 91,204
Total investment securities at fair value $ 146,687 135,585
Long-term investment securities at fair value   33,981
Douglas Elliman    
Liabilities:    
Voting interest acquired 29.41%  
Payout agreement period (in years) 4 years  
Marketable equity securities    
Assets:    
Equity Securities, FV-NI, Current $ 19,560 21,155
Mutual funds invested in debt securities    
Assets:    
Equity Securities, FV-NI, Current 23,221 23,226
U.S. Government securities    
Assets:    
Debt securities available for sale 6,481  
Corporate securities    
Assets:    
Debt securities available for sale 47,531  
U.S. mortgage-backed securities    
Assets:    
Debt securities available for sale 19,572  
Commercial paper    
Assets:    
Debt securities available for sale 29,103  
Foreign fixed-income securities    
Assets:    
Debt securities available for sale 1,219  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper    
Assets:    
Debt securities available for sale   0
Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Debt securities available for sale   9,086
Significant Unobservable Inputs (Level 3) | Commercial paper    
Assets:    
Debt securities available for sale   0
Recurring    
Assets:    
Total investment securities at fair value 146,687 135,585
Long-term investment securities at fair value 32,089 33,981
Total 333,895 410,135
Liabilities:    
Fair value of contingent liability 2,646  
Total 2,646  
Recurring | Marketable equity securities    
Assets:    
Equity Securities, FV-NI, Current 19,560 21,155
Recurring | Mutual funds invested in debt securities    
Assets:    
Equity Securities, FV-NI, Current 23,221 23,226
Recurring | Total equity securities at fair value    
Assets:    
Equity Securities, FV-NI, Current 42,781 44,381
Recurring | U.S. Government securities    
Assets:    
Debt securities available for sale 6,481 19,200
Recurring | Corporate securities    
Assets:    
Debt securities available for sale 47,531 52,434
Recurring | U.S. mortgage-backed securities    
Assets:    
Debt securities available for sale 19,572 10,484
Recurring | Commercial paper    
Assets:    
Debt securities available for sale 29,103 9,086
Recurring | Foreign fixed-income securities    
Assets:    
Debt securities available for sale 1,219  
Recurring | Total debt securities available for sale    
Assets:    
Debt securities available for sale 103,906 91,204
Recurring | Money market funds    
Assets:    
Cash and cash equivalents 130,583 194,095
Recurring | Commercial paper    
Assets:    
Cash and cash equivalents 24,426 44,397
Recurring | Certificates of deposit    
Assets:    
Cash and cash equivalents 110 1,542
Recurring | Bonds    
Assets:    
Cash and cash equivalents   535
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total investment securities at fair value 42,781 44,381
Long-term investment securities at fair value   0
Total 173,364 239,011
Liabilities:    
Fair value of contingent liability 0  
Total 0  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities    
Assets:    
Equity Securities, FV-NI, Current 19,560 21,155
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds invested in debt securities    
Assets:    
Equity Securities, FV-NI, Current 23,221 23,226
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities at fair value    
Assets:    
Equity Securities, FV-NI, Current 42,781 44,381
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. mortgage-backed securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper    
Assets:    
Debt securities available for sale 0  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign fixed-income securities    
Assets:    
Debt securities available for sale 0  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total debt securities available for sale    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds    
Assets:    
Cash and cash equivalents 130,583 194,095
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper    
Assets:    
Cash and cash equivalents 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit    
Assets:    
Cash and cash equivalents 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Bonds    
Assets:    
Cash and cash equivalents   535
Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Total investment securities at fair value 103,906 91,204
Long-term investment securities at fair value   0
Total 128,442 137,143
Liabilities:    
Fair value of contingent liability 0  
Total 0  
Recurring | Significant Other Observable Inputs (Level 2) | Marketable equity securities    
Assets:    
Equity Securities, FV-NI, Current 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds invested in debt securities    
Assets:    
Equity Securities, FV-NI, Current 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Total equity securities at fair value    
Assets:    
Equity Securities, FV-NI, Current 0 0
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government securities    
Assets:    
Debt securities available for sale 6,481 19,200
Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets:    
Debt securities available for sale 47,531 52,434
Recurring | Significant Other Observable Inputs (Level 2) | U.S. mortgage-backed securities    
Assets:    
Debt securities available for sale 19,572 10,484
Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Debt securities available for sale 29,103  
Recurring | Significant Other Observable Inputs (Level 2) | Foreign fixed-income securities    
Assets:    
Debt securities available for sale 1,219  
Recurring | Significant Other Observable Inputs (Level 2) | Total debt securities available for sale    
Assets:    
Debt securities available for sale 103,906 91,204
Recurring | Significant Other Observable Inputs (Level 2) | Money market funds    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Cash and cash equivalents 24,426 44,397
Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit    
Assets:    
Cash and cash equivalents 110 1,542
Recurring | Significant Other Observable Inputs (Level 2) | Bonds    
Assets:    
Cash and cash equivalents   0
Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Total investment securities at fair value 0 0
Long-term investment securities at fair value   0
Total 0 0
Liabilities:    
Fair value of contingent liability 2,646  
Total 2,646  
Recurring | Significant Unobservable Inputs (Level 3) | Marketable equity securities    
Assets:    
Equity Securities, FV-NI, Current 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds invested in debt securities    
Assets:    
Equity Securities, FV-NI, Current 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Total equity securities at fair value    
Assets:    
Equity Securities, FV-NI, Current 0 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. mortgage-backed securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper    
Assets:    
Debt securities available for sale 0  
Recurring | Significant Unobservable Inputs (Level 3) | Foreign fixed-income securities    
Assets:    
Debt securities available for sale 0  
Recurring | Significant Unobservable Inputs (Level 3) | Total debt securities available for sale    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Money market funds    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Certificates of deposit    
Assets:    
Cash and cash equivalents $ 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Bonds    
Assets:    
Cash and cash equivalents   $ 0