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Fair Value and Equity Investments, Equity Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Equity Securities without Readily Determinable Fair Value [Line Items]        
Upward fair value adjustments on equity securities   $ 18,077 $ 0  
Equity Securities [Member]        
Equity Securities without Readily Determinable Fair Value [Line Items]        
Carrying amount of equity securities without readily determinable fair values $ 28,100 28,100   $ 5,000
Additional investment made 5,000      
Equity Securities [Member] | Other Income (Expense), Net [Member]        
Equity Securities without Readily Determinable Fair Value [Line Items]        
Upward fair value adjustments on equity securities $ 18,100 $ 18,100