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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($)
Cash and Cash Equivalents [Abstract] |
Due in 1 year or less, Cost | $ 405,836
Due in 1-2 years, Cost | 274,570
Investments not due at a single maturity date, Cost | 160,346
Adjusted Cost | 840,752
Due in 1 year or less, Fair Value | 404,794
Due in 1-2 years, Fair Value | 273,114
Investments not due at a single maturity date, Fair Value | 160,346
Total, Fair Value | $ 838,254
Weighted average maturity | 8 months

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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