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Investments - Schedule of Proceeds from Sales and Maturities of Marketable Securities Plus Resulting Realized Gains and Losses (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]    
Proceeds from the sales and maturities of marketable securities $ 175,499 $ 147,859
Realized gains   $ 51
Realized losses $ 977