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Investments - Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Restricted Cash and Cash Equivalents Items    
Assets Held-in-trust $ 19,677 $ 17,439
Restricted Cash 20,309 18,070
Regulatory Assets, Fair Value Disclosure 632 631
Security Deposit $ 1,495 $ 1,495