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Investments - Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Amortized Cost    
Less than 12 months $ 1,045,120 $ 670,584
12 months or greater 310,494 572,349
Amortized Cost 1,355,614 1,242,933
Fair Value    
Less than 12 months 1,039,333 670,306
12 months or greater 293,610 569,959
Fair Value 1,332,943 1,240,265
Accrued interest income $ 3,000 $ 3,700