Investment Securities (Schedule of Investment Securities at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Debt securities available for sale	$ 91,838	$ 103,906
Long-term investment securities at fair value	31,057	32,089
Total equity securities at fair value	72,557	74,870
Total investment securities at fair value	164,395	178,776
Total investment securities at fair value	133,338	146,687
Equity-method investments	18,742	20,984
Total long-term investments	49,799	53,073
Other equity securities at cost	6,200	5,200
Marketable equity securities
Debt and Equity Securities, FV-NI [Line Items]
Equity securities at fair value	18,962	19,560
Mutual funds invested in debt securities
Debt and Equity Securities, FV-NI [Line Items]
Equity securities at fair value	$ 22,538	$ 23,221

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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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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