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Fair Value of Financial Instruments Transfers between Levels (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Changes in the Company's Level 3 fair value securities      
Transfers from Level 1 to Level 2 $ 0 $ 0  
Transfers from Level 2 to Level 1 0 0  
Balance at beginning of period 1,698 1,698 $ 516
Purchases 557   1,182
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Balance at end of period 2,255 1,698 $ 1,698
Alternative investments fair value $ 40,450 $ 38,570  
Period of advance notice before quarter end 45 days