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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Cash and Cash Equivalents [Abstract]
Due in 1 year or less, Cost	$ 532,338
Due in 1-2 years, Cost	278,851
Investments not due at a single maturity date, Cost	150,002
Adjusted Cost	961,191
Due in 1 year or less, Fair Value	534,932
Due in 1-2 years, Fair Value	280,492
Investments not due at a single maturity date, Fair Value	150,002
Total, Fair Value	$ 965,426
Weighted average maturity	9 months

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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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