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Marketable Equity Securities (Tables) | 6 Months Ended
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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 |

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