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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Cash and Cash Equivalents [Abstract]
Due in 1 year or less, Cost	$ 1,314,507
Due in 1-2 years, Cost	712,025
Investments not due at a single maturity date, Cost	532,493
Adjusted Cost	2,559,025
Due in 1 year or less, Fair Value	1,315,220
Due in 1-2 years, Fair Value	711,224
Investments not due at a single maturity date, Fair Value	532,493
Total, Fair Value	$ 2,558,937
Weighted average maturity	12 months

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Available For Sale Securities, Weighted Average Maturity

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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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