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Investments - Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Less than 12 months |  | $ 1,045,120
12 months or greater |  | 310,494
Amortized Cost |  | 1,355,614
Fair Value |  |
Less than 12 months |  | 1,039,333
12 months or greater |  | 293,610
Fair Value | $ 0 | 1,332,943
Accrued interest income | $ 0 | $ 3,000

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next twelve months following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after twelve months following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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