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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands	3 Months Ended
	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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Available For Sale Securities, Weighted Average Maturity

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Available-for-sale Securities, Debt Maturities, Year One Through Two, Amortized Cost Basis

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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