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Investments - Summary of Information Relating to Investments Measured at Fair Value for Company has Used Unobservable Inputs to Determine Fair Value (Parenthetical) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers out of Level III $ 10,599 [1] $ 17,056 [2]
Transfers into Level III 10,286 [3] 19,847 [4]
Debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers out of Level III 10,599 [1] 17,056 [2]
Transfers into Level III $ 10,286 [3] $ 19,847 [4]
[1] Transfers out of Level III represent a transfer of $10.6 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of June 30, 2023.
[2] Transfers out of Level III represent a transfer of $17.1 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of June 30, 2022.
[3] Transfers into Level III represent a transfer of $10.3 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of June 30, 2023.
[4] Transfers into Level III represent a transfer of $19.8 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of June 30, 2022.