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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Adjusted Cost |
Due in 1 year or less, Adjusted Cost | $ 1,038,124
Due in 1-2 years, Adjusted Cost | 813,889
Investments not due at a single maturity date, Adjusted Cost | 684,499
Adjusted Cost | 2,536,512
Fair Value |
Due in 1 year or less, Fair Value | 1,038,345
Due in 1-2 years, Fair Value | 813,500
Investments not due at a single maturity date, Fair Value | 684,499
Total, Fair Value | $ 2,536,344
Weighted average maturity | 12 months

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