Quarterly report pursuant to Section 13 or 15(d)

Investments in Equity Securities (Details)

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Investments in Equity Securities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]          
Cost $ 58,905,000   $ 58,905,000    
Fair Value 29,940,000   29,940,000   $ 0
Unrealized loss on equity securities 28,965,000 $ 0 28,965,000 $ 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 24,316,000   24,316,000    
Equity rights          
Debt and Equity Securities, FV-NI [Line Items]          
Cost 11,064,000   11,064,000    
Fair Value $ 5,624,000   $ 5,624,000