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Investments - Net Realized and Unrealized Gains (Losses) on Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Gain (Loss) on Securities [Line Items]      
Equity securities, gross gains $ 146 $ 1,024  
Equity securities, gross losses (1,017) (378)  
Equity securities, net (871) 646  
Net realized and unrealized gains (losses) on investment, gross gains 11,470 2,665  
Net realized and unrealized gains (losses) on investment, gross losses (2,720) (1,660)  
Net realized and unrealized investment gains 8,750 1,005  
Net gains recognized for equity securities divested 0 (176)  
Unrealized (losses) gains recognized for equity securities still held at reporting date (871) 470  
Proceeds from sales of fixed maturities classified as available-for-sale 23,835 954  
Deferred income tax 147   $ 151
Net unrealized losses, net of deferred income tax (6,770)   (7,784)
Change, net of deferred income tax 1,014   7,884
Net unrealized losses on fixed maturity investments      
Gain (Loss) on Securities [Line Items]      
Fixed maturities, gross gains 0    
Fixed maturities, gross losses (218)    
Fixed maturities, net (218)    
Net unrealized losses on fixed maturity investments (6,917)   $ (7,935)
Other investments      
Gain (Loss) on Securities [Line Items]      
Other investments, gross gains 11,324 1,641  
Other investments, gross losses (1,485) (1,282)  
Other investments, net $ 9,839 $ 359