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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Measurements |  |
Marketable securities | $ 610,450 | $ 601,989
Carrying amount of long-term debt | 3,201,398 | 3,109,218
Recurring | Estimate of Fair Value Measurement |  |
Fair Value Measurements |  |
Marketable securities | 610,450 | 601,989
Cash and cash equivalents | 246,001 | 258,421
Total Assets Measured at Fair Value | 856,451 | 860,410
Cost of cash and cash equivalents and available for sale securities | 856,400 | 860,400
Recurring | Estimate of Fair Value Measurement | Corporate Bond Securities |  |
Fair Value Measurements |  |
Marketable securities | 170,918 | 54,673
Recurring | Estimate of Fair Value Measurement | Commercial Paper |  |
Fair Value Measurements |  |
Marketable securities | 439,532 | 547,316
Recurring | Level 1 |  |
Fair Value Measurements |  |
Cash and cash equivalents | 246,001 | 258,421
Total Assets Measured at Fair Value | 246,001 | 258,421
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable securities | 610,450 | 601,989
Total Assets Measured at Fair Value | 610,450 | 601,989
Fair value of long-term debt | 3,200,000 | 3,200,000
Carrying amount of long-term debt | 3,200,000 | 3,100,000
Recurring | Level 2 | Corporate Bond Securities |  |
Fair Value Measurements |  |
Marketable securities | 170,918 | 54,673
Recurring | Level 2 | Commercial Paper |  |
Fair Value Measurements |  |
Marketable securities | $ 439,532 | $ 547,316

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