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Fair Value Measurements (Schedule of Effective Maturity Dates of Held to Maturity Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Investment maturity    
Held-to-maturity maturities, less than 1 year, book value $ 365,409 $ 805,400
Held-to-maturity maturities, less than 1 year, fair value $ 364,712 $ 805,250