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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Adjusted Cost
Due in 1 year or less, Adjusted Cost	$ 1,038,124
Due in 1-2 years, Adjusted Cost	813,889
Investments not due at a single maturity date, Adjusted Cost	684,499
Adjusted Cost	2,536,512
Fair Value
Due in 1 year or less, Fair Value	1,038,345
Due in 1-2 years, Fair Value	813,500
Investments not due at a single maturity date, Fair Value	684,499
Total, Fair Value	$ 2,536,344
Weighted average maturity	12 months

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