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Cash and Cash Equivalents, and Investments - Contractual Maturity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Cash and Cash Equivalents [Abstract]
Due in 1 year or less, Cost	$ 664,119
Due in 1-2 years, Cost	523,270
Investments not due at a single maturity date, Cost	464,799
Adjusted Cost	1,652,188
Due in 1 year or less, Fair Value	665,567
Due in 1-2 years, Fair Value	523,628
Investments not due at a single maturity date, Fair Value	464,799
Total, Fair Value	$ 1,653,994
Weighted average maturity	12 months

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