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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Measurements |  |  |
Marketable Securities | $ 380,242 | $ 503,503 | [1]
Fair Value of Financial Instruments |  |  |
Carrying amount of long-term debt | 3,109,049 | 2,687,024 |
Recurring |  |  |
Fair Value Measurements |  |  |
Cash, Cash Equivalents | 324,561 | 181,792 |
Marketable Securities | 380,242 | 503,503 |
Total Assets Measured at Fair Value | 704,803 | 685,295 |
Cost of cash and cash equivalents and available for sale securities | 704,800 | 685,500 |
Fair value of cash and cash equivalents and available for sale securities | 704,800 | 685,300 |
Recurring | Bonds and bond funds |  |  |
Fair Value Measurements |  |  |
Marketable Securities | 159,942 | 344,251 |
Recurring | Commercial paper |  |  |
Fair Value Measurements |  |  |
Marketable Securities | 220,300 | 159,252 |
Recurring | Level 1 |  |  |
Fair Value Measurements |  |  |
Cash, Cash Equivalents | 324,561 | 181,792 |
Total Assets Measured at Fair Value | 324,561 | 181,792 |
Recurring | Level 2 |  |  |
Fair Value Measurements |  |  |
Marketable Securities | 380,242 | 503,503 |
Total Assets Measured at Fair Value | 380,242 | 503,503 |
Fair Value of Financial Instruments |  |  |
Fair value of long-term debt | 3,150,000 | 2,700,000 |
Carrying amount of long-term debt | 3,130,000 | 2,710,000 |
Recurring | Level 2 | Bonds and bond funds |  |  |
Fair Value Measurements |  |  |
Marketable Securities | 159,942 | 344,251 |
Recurring | Level 2 | Commercial paper |  |  |
Fair Value Measurements |  |  |
Marketable Securities | $ 220,300 | $ 159,252 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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