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

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

 

    Marketable equity securities at June 30, 2021 
        Gross unrealized   Gross unrealized     
    Cost   gains   losses   Fair value 
Common shares   $24,262,000   $7,763,000   $(1,853,000)  $30,172,000 

 

 

    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   270,742,000 
Conversion of debt securities to marketable securities   2,656,000 
Sales of marketable equity securities in operations   (251,126,000)
Sales of marketable equity securities   (430,000)
Realized gains on marketable equity securities   12,283,000 
Unrealized gains on marketable equity securities   3,484,000 
Balance at June 30, 2021  $30,172,000