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Equity Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Summary of Investments in Equity Securities, by Classification | Investments in equity securities, by classification, are summarized as follows:
(in thousands) |  | September 30, 2021 |  |  | December 31, 2020 |
Marketable equity securities |  | $ | 760,758 |  |  | $ | 464,126 |
Non-marketable equity securities |  |  | 379,548 |  |  |  | 217,104 |
Equity method investments |  |  | 69,373 |  |  |  | 68,781 |
|  | $ | 1,209,679 |  |  | $ | 750,011 |
Summary of Investments in Marketable Equity Securities | Investments in marketable equity securities are summarized as follows:
(in thousands) |  | Cost |  |  | Estimated fair value |
September 30, 2021 |  |  |  |  |  |  |  |
Preferred stocks |  | $ | 16,810 |  |  | $ | 16,944 |
Common stocks (1) |  |  | 443,137 |  |  |  | 743,814 |
|  | $ | 459,947 |  |  | $ | 760,758 |
December 31, 2020 |  |  |  |  |  |  |  |
Preferred stocks |  | $ | 22,163 |  |  | $ | 19,479 |
Common stocks |  |  | 354,157 |  |  |  | 444,647 |
|  | $ | 376,320 |  |  | $ | 464,126 |
Summary of Investments in Non-Marketable Equity Securities | Investments in non-marketable equity securities are summarized as follows:
(in thousands) |  | Cost |  |  |  | Unrealized gains |  |  | Carrying amount |
September 30, 2021 |  | $ | 198,155 |  |  | $ | 181,393 |  |  | $ | 379,548 |
December 31, 2020 |  | $ | 200,858 |  |  | $ | 16,246 |  |  | $ | 217,104 |

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