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Investment Securities - Investments, Debt and Equity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Investments in equity securities $ 36,651 $ 2,807
Investments in equity securities accounted for under the equity method 11,141 $ 849
Long-Term Cash Awards    
Investments, Debt and Equity Securities [Abstract]    
Total investment securities 35,900  
Marketable Securities [Line Items]    
Investments $ 35,900