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Investments - Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investments    
Amortized Cost, Current $ 1,098 $ 1,385
Amortized Cost, Due from one through five years 3,757 3,977
Amortized Cost, Due from six through ten years 2,347 2,347
Amortized Cost, Due from eleven through twenty years 799 799
Amortized Cost, Total 8,001 8,508
Market Value, Current 1,098 1,381
Market Value, Due from one through five years 3,758 3,950
Market Value, Due from six through ten years 2,492 2,455
Market Value, Due from eleven through twenty years 796 773
Market Value, Total $ 8,144 $ 8,559