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Investments - Scheduled Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Amortized Cost    
Within one year $ 45,508 $ 58,733
After one year through five years 0 0
After 5 years through 10 years 0 0
After 10 years 0 0
Total investments 45,508 58,733
Fair Value    
Within one year 45,428 58,589
After one year through five years 0 0
After 5 years through 10 years 0 0
After 10 years 0 0
Total investments $ 45,428 $ 58,589