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Marketable Equity Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Marketable Equity Securities  
Marketable securities in equity securities with readily determinable market prices consisted of the following as of September 30, 2021 and December 31, 2020:

Marketable securities in equity securities with readily determinable market prices consisted of the following as of September 30, 2021 and December 31, 2020:

 

   Marketable equity securities at September 30, 2021 
        Gross unrealized   Gross unrealized      
   Cost   gains   losses   Fair value 
Common shares  $55,233,000   $2,112,000   $(7,414,000)  $49,931,000 

 

 

   Marketable equity securities at December 31, 2020 
        Gross unrealized   Gross unrealized      
   Cost   gains   losses   Fair value 
Common shares  $1,506,000   $1,083,000   $(26,000)  $2,563,000 
The following table presents additional information about marketable equity securities:

The following table presents additional information about marketable equity securities:

 

   Marketable 
   Equity Securities 
Balance at January 1, 2021  $2,563,000 
Purchases of marketable equity securities in operations   338,620,000 
Purchases of marketable equity securities   2,144,000 
Conversion of debt securities to marketable securities   2,656,000 
Sales of marketable equity securities in operations   (303,923,000)
Sales of marketable equity securities   (430,000)
Realized gains on marketable equity securities   19,040,000 
Realized losses on marketable equity securities   (4,386,000)
Unrealized gains on marketable equity securities   (6,353,000)
Balance at September 30, 2021  $49,931,000