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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($)
Cash and Cash Equivalents [Abstract] |
Due in 1 year or less, Cost | $ 1,221,089
Due in 1-2 years, Cost | 485,143
Investments not due at a single maturity date, Cost | 807,034
Adjusted Cost | 2,513,266
Due in 1 year or less, Fair Value | 1,221,666
Due in 1-2 years, Fair Value | 484,853
Investments not due at a single maturity date, Fair Value | 807,034
Total, Fair Value | $ 2,513,553
Weighted average maturity | 12 months

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