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Investments - Scheduled Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Amortized Cost    
Within one year $ 21,841 $ 16,799
After one year through five years 0 0
After 5 years through 10 years 0 0
After 10 years 0 0
Total investments 21,841 16,799
Fair Value    
Within one year 21,820 16,789
After one year through five years 0 0
After 5 years through 10 years 0 0
After 10 years 0 0
Total investments $ 21,820 $ 16,789