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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments, All Other Investments [Abstract] |
Schedule of Investments | The following table presents our financial instruments:
|  | June 30, 2022 |  | December 31, 2021
Cash and cash equivalents |  | $ | 253,062 |  |  | $ | 309,171 |
Held-to-maturity investments |  | — |  |  | 98,653 |
Available-for-sale investments |  | 60,930 |  |  | — |
Equity investments |  | 10,000 |  |  | 10,000 |
Total |  | $ | 323,992 |  |  | $ | 417,824 |
Schedule of Available-for-sale Activity | The following table presents the components of our available-for-sale investments:
| June 30, 2022 |  | December 31, 2021
Amortized cost | $ | 62,016 |  |  | $ | — |
Unrealized gains | 39 |  |  | — |
Unrealized losses | (1,125) |  |  | — |
Estimated fair value | $ | 60,930 |  |  | $ | — |
The following table presents the activity on our available-for-sale investments:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Proceeds from sales and maturities | $ | 17,923 |  |  | $ | 56,364 |  |  | $ | 40,595 |  |  | $ | 91,395 |
Realized losses on sales, net of tax | (48) |  |  | — |  |  | (7) |  |  | — |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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