Investment Securities (Investment Securities at Fair Value Schedule) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Debt securities available for sale	$ 108,489	$ 91,204
PropTech convertible trading debt securities	2,481	0
Long-term investment securities at fair value	33,053	34,218
Total equity securities at fair value	81,565	78,599
Total investment securities at fair value	192,535	169,803
PropTech convertible trading debt securities	2,481	0
Current investment securities at fair value	157,001	135,585
Equity-method investments	19,828	18,310
Total long-term investments	55,362	52,528
Marketable equity securities
Debt and Equity Securities, FV-NI [Line Items]
Equity securities at fair value	25,187	21,155
Mutual funds invested in debt securities
Debt and Equity Securities, FV-NI [Line Items]
Equity securities at fair value	$ 23,325	$ 23,226

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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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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