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Investments in Equity Securities (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]              
Cost $ 58,905,000       $ 58,905,000    
Fair Value 7,655,000       7,655,000   $ 0
Unrealized loss on equity securities 22,285,000 $ 0 $ 0 $ 0 51,250,000 $ 0  
Realized gain (loss) on equity securities   $ 0       $ 0  
Equity shares              
Debt and Equity Securities, FV-NI [Line Items]              
Cost 47,841,000       47,841,000    
Fair Value 6,217,000       6,217,000    
Equity rights              
Debt and Equity Securities, FV-NI [Line Items]              
Cost 11,064,000       11,064,000    
Fair Value $ 1,438,000       $ 1,438,000