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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Measurements |  |
Marketable securities | $ 503,503 | $ 409,898
Total Assets Measured at Fair Value | 685,523 | 556,780
Recurring | Fair value |  |
Fair Value Measurements |  |
Marketable securities | 503,503 | 409,898
Cash, Cash Equivalents and Restricted Cash | 181,792 | 155,009
Total Assets Measured at Fair Value | 685,295 | 564,907
Recurring | Fair value | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 344,251 | 409,885
Recurring | Fair value | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities | 159,252 | 13
Recurring | Level 1 |  |
Fair Value Measurements |  |
Cash, Cash Equivalents and Restricted Cash | 181,792 | 155,009
Total Assets Measured at Fair Value | 181,792 | 155,009
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable securities | 503,503 | 409,898
Total Assets Measured at Fair Value | 503,503 | 409,898
Recurring | Level 2 | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 344,251 | 409,885
Recurring | Level 2 | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities | $ 159,252 | $ 13

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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