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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Cash and Cash Equivalents [Abstract]
Due in 1 year or less, Cost	$ 1,028,399
Due in 1-2 years, Cost	521,269
Investments not due at a single maturity date, Cost	202,522
Adjusted Cost	1,752,190
Due in 1 year or less, Fair Value	1,031,000
Due in 1-2 years, Fair Value	521,261
Investments not due at a single maturity date, Fair Value	202,522
Total, Fair Value	$ 1,754,783
Weighted average maturity	12 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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