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Fair Value Measurement - Contractual Maturities of Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Due within one year $ 277,880 $ 274,805
After one but within five years 3,085 26,278
Estimated Fair Value $ 280,965 $ 301,083