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Fair Value Measurements - Summarizes Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Nov. 23, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying Value $ 104,779 $ 105,515  
Estimated Fair Value 101,862 105,476  
Surplus note      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying Value $ 4,779 5,515  
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Stated percentage 5.625%   5.625%
Surplus note | Surplus note      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying Value $ 4,779 5,515  
Estimated Fair Value 4,497 5,126  
5.625% Senior unsecured notes      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying Value 100,000 100,000  
Estimated Fair Value $ 97,365 $ 100,350