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Cash Equivalents and Investments - Tabular Disclosure - Total (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Cash Equivalents and Investments    
Total, Amortized Cost $ 1,354,736 $ 547,454
Total, Unrealized Gain 1,338 518
Total, Unrealized Losses (174) (12)
Total, Fair Value $ 1,355,900 $ 547,960