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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Measurements |  |
Marketable Securities | $ 965,347 | $ 601,989
Recurring | Estimate of Fair Value Measurement |  |
Fair Value Measurements |  |
Marketable Securities | 965,347 | 601,989
Investments in Other Companies | 26,112 |
Cash and Cash Equivalents | 38,850 | 258,421
Total Assets Measured at Fair Value | 1,030,309 | 860,410
Cost of cash and cash equivalents and available for sale securities | 1,010,200 | 860,400
Recurring | Estimate of Fair Value Measurement | Corporate Bond Securities |  |
Fair Value Measurements |  |
Marketable Securities | 645,346 | 54,673
Recurring | Estimate of Fair Value Measurement | Commercial Paper |  |
Fair Value Measurements |  |
Marketable Securities | 320,001 | 547,316
Recurring | Level 1 |  |
Fair Value Measurements |  |
Investments in Other Companies | 9,240 |
Cash and Cash Equivalents | 38,850 | 258,421
Total Assets Measured at Fair Value | 48,090 | 258,421
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable Securities | 965,347 | 601,989
Total Assets Measured at Fair Value | 965,347 | 601,989
Recurring | Level 2 | Corporate Bond Securities |  |
Fair Value Measurements |  |
Marketable Securities | 645,346 | 54,673
Recurring | Level 2 | Commercial Paper |  |
Fair Value Measurements |  |
Marketable Securities | 320,001 | $ 547,316
Recurring | Level 3 |  |
Fair Value Measurements |  |
Investments in Other Companies | 16,872 |
Total Assets Measured at Fair Value | $ 16,872 |

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