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Investment Securities (Investment Securities at Fair Value Schedule) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]    
Debt securities available for sale $ 89,239 $ 83,445
Total equity securities at fair value 66,472 91,977
Long-term investment securities at fair value 31,619 45,781
Total investment securities at fair value 155,711 175,422
Current investment securities at fair value 124,092 129,641
Equity-method investments 16,240 15,942
Marketable equity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total equity securities at fair value 11,897 23,819
Mutual funds invested in debt securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total equity securities at fair value $ 22,956 $ 22,377