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Organization and Basis of Presentation - Summary of Financial Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Equity securities:        
Gross Unrealized Gain (Loss) $ 6,276 $ (8,696)    
Carrying Value 2,400     $ 2,500
Available for sale        
Equity and Debt Securities, Amortized Cost 142,906     131,770
Equity and Debt Securities, Gross Unrealized Gain (Loss) 22,359     15,998
Equity and Debt Securities, Marketable Securities 165,265     147,768
Investment funds - debt securities        
Equity securities:        
Cost 61,430     49,646
Gross Unrealized Gain (Loss) (647)   $ 985  
Carrying Value 60,783     50,631
Common stock and stock funds        
Equity securities:        
Cost 80,425     81,074
Gross Unrealized Gain (Loss) 22,909   $ 15,001  
Carrying Value 103,334     96,075
Investment-grade unsecured debt        
Available for sale        
Cost 1,051     1,050
Gross Unrealized Gain (Loss) 97     12
Carrying Value $ 1,148     $ 1,062