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Marketable Securities - Proceeds from Sale of Securities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]    
Fixed maturity debt securities $ 114,912 $ 128,954
Proceeds from equity securities 3 0
Proceeds from sales of marketable securities 114,915 128,954
Fixed maturity debt securities, gross realized gains 6 7
Equity securities, gross realized gains 0 0
Total marketable securities, gross realized gains 6 7
Fix maturity debt securities, gross realized losses 0 (2)
Equity securities, gross realized losses 0 0
Total marketable securities, gross realized losses 0 (2)
Fixed maturity debt securities, net realized losses 6 5
Equity securities, net realized losses 0 0
Total marketable securities, net realized losses $ 6 $ 5