Investment Securities (Investment Securities at Fair Value Schedule) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Debt securities available for sale	$ 54,885	$ 83,445
Total equity securities at fair value	66,990	91,977
Long-term investment securities at fair value	33,232	45,781
Total investment securities at fair value	121,875	175,422
Current investment securities at fair value	88,643	129,641
Equity-method investments	14,817	15,942
Marketable equity securities
Debt and Equity Securities, FV-NI [Line Items]
Total equity securities at fair value	11,091	23,819
Mutual funds invested in debt securities
Debt and Equity Securities, FV-NI [Line Items]
Total equity securities at fair value	$ 22,667	$ 22,377

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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