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Summary of Critical and Significant Accounting Policies - Marketable Securities (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Marketable Securities [Line Items]        
Carrying Value   $ 3,600 $ 6,700  
Equity securities:        
Unrealized gain (loss) on equity securities recognized through income   5,710 (5,159) $ 0
Carrying Value   3,600 6,700  
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]        
Total - Marketable securities, amortized cost   140,649 211,960  
Total - Marketable securities, gross unrealized gain (loss)   3,544 (2,415)  
Total - Marketable securities, carrying value   144,193 209,545  
Proceeds from maturity of mortgage backed security $ 83,100      
Accelerated interest income $ 7,000      
Proceeds from sale and maturities of marketable securities   147,500 31,500 35,500
Marketable securities, realized gain (loss)   1,300 700 1,900
Unrealized gain (loss) on equity securities recognized through income   5,710 (5,159) $ 0
Interest and Other Income        
Equity securities:        
Unrealized gain (loss) on equity securities recognized through income   5,700 (5,200)  
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]        
Unrealized gain (loss) on equity securities recognized through income   5,700 (5,200)  
Investment Funds - Debt Securities        
Marketable Securities [Line Items]        
Carrying Value   30,132 31,366  
Equity securities:        
Amortized Cost   29,588 31,934  
Unrealized gain (loss) on equity securities recognized through income   544 (568)  
Carrying Value   30,132 31,366  
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]        
Unrealized gain (loss) on equity securities recognized through income   544 (568)  
Common Stock and Stock Funds        
Marketable Securities [Line Items]        
Carrying Value   37,868 38,060  
Equity securities:        
Amortized Cost   34,941 39,731  
Unrealized gain (loss) on equity securities recognized through income   2,927 (1,671)  
Carrying Value   37,868 38,060  
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]        
Unrealized gain (loss) on equity securities recognized through income   2,927 (1,671)  
U.S. Treasury Securities        
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]        
Available-for-sale, amortized cost   2,421 8,983  
Available-for-sale, gross unrealized gain (Loss)   13 (31)  
Available-for-sale, carrying value   2,434 8,952  
Investment-Grade Unsecured Bonds        
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]        
Available-for-sale, amortized cost   1,048 4,125  
Available-for-sale, gross unrealized gain (Loss)   60 (145)  
Available-for-sale, carrying value   1,108 3,980  
Mortgage Backed Securities        
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]        
Held to maturity, amortized cost   72,651 127,187  
Held to maturity, gross unrealized gain (loss)   0 0  
Held to maturity carrying value   $ 72,651 $ 127,187