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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Measurements |  |
Marketable securities | $ 403,793 | $ 432,966
Fair Value of Financial Instruments |  |
Carrying amount of long-term debt | 3,068,057 | 2,993,115
Recurring |  |
Fair Value Measurements |  |
Cost of cash and cash equivalents and available for sale securities | 821,800 | 520,200
Recurring | Fair value |  |
Fair Value Measurements |  |
Cash and cash equivalents | 418,228 | 87,206
Marketable securities | 403,793 | 432,966
Total assets measured at fair value | 822,021 | 520,172
Recurring | Fair value | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 95,183 | 267,243
Recurring | Fair value | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities | 308,610 | 165,723
Recurring | Level 1 |  |
Fair Value Measurements |  |
Cash and cash equivalents | 418,228 | 87,206
Total assets measured at fair value | 418,228 | 87,206
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable securities | 403,793 | 432,966
Total assets measured at fair value | 403,793 | 432,966
Fair Value of Financial Instruments |  |
Fair value of long-term debt | 3,100,000 | 3,000,000
Carrying amount of long-term debt | 3,100,000 | 3,000,000
Recurring | Level 2 | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 95,183 | 267,243
Recurring | Level 2 | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities | $ 308,610 | $ 165,723

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