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Marketable Securities (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt securities, available-for-sale    
Less than 12 Months, fair value $ 338,605 $ 251,897
Less than 12 months, gross unrealized loss (1,071) (122)
U.S. Government bonds and notes    
Debt securities, available-for-sale    
Less than 12 Months, fair value 82,822 70,548
Less than 12 months, gross unrealized loss (301) (40)
Corporate notes, bonds and commercial paper    
Debt securities, available-for-sale    
Less than 12 Months, fair value 255,783 181,349
Less than 12 months, gross unrealized loss $ (770) $ (82)