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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Measurements |  |
Marketable securities | $ 360,945 | $ 503,503
Total Assets Measured at Fair Value | 689,372 | 685,523
Fair Value of Financial Instruments |  |
Fair value of long-term debt | 3,157,300 | 2,698,400
Recurring | Fair value |  |
Fair Value Measurements |  |
Marketable securities | 360,945 | 503,503
Cash, Cash Equivalents and Restricted Cash | 328,384 | 181,792
Total Assets Measured at Fair Value | 689,329 | 685,295
Recurring | Fair value | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 229,783 | 344,251
Recurring | Fair value | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities | 131,162 | 159,252
Recurring | Level 1 |  |
Fair Value Measurements |  |
Cash, Cash Equivalents and Restricted Cash | 328,384 | 181,792
Total Assets Measured at Fair Value | 328,384 | 181,792
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable securities | 360,945 | 503,503
Total Assets Measured at Fair Value | 360,945 | 503,503
Recurring | Level 2 | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 229,783 | 344,251
Recurring | Level 2 | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities | $ 131,162 | $ 159,252

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes cash including restricted cash and cash equivalents. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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