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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Cash and Cash Equivalents [Abstract]
Due in 1 year or less, Cost	$ 1,221,089
Due in 1-2 years, Cost	485,143
Investments not due at a single maturity date, Cost	807,034
Adjusted Cost	2,513,266
Due in 1 year or less, Fair Value	1,221,666
Due in 1-2 years, Fair Value	484,853
Investments not due at a single maturity date, Fair Value	807,034
Total, Fair Value	$ 2,513,553
Weighted average maturity	12 months

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