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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Cash and Cash Equivalents [Abstract] |
Due in 1 year or less, Cost | $ 664,119
Due in 1-2 years, Cost | 523,270
Investments not due at a single maturity date, Cost | 464,799
Adjusted Cost | 1,652,188
Due in 1 year or less, Fair Value | 665,567
Due in 1-2 years, Fair Value | 523,628
Investments not due at a single maturity date, Fair Value | 464,799
Total, Fair Value | $ 1,653,994
Weighted average maturity | 12 months

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