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Investments - Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Less than 12 months $ 437,867 $ 670,584
12 months or greater 407,642 572,349
Amortized Cost 845,509 1,242,933
Fair Value    
Less than 12 months 433,615 670,306
12 months or greater 385,825 569,959
Fair Value 819,440 1,240,265
Accrued interest income $ 3,000 $ 3,700