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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Other Investments    
Fair Value $ 246,499 $ 281,001
Other Long-term Investments    
Other Investments    
Cost or adjusted/amortized cost 36,167 22,969
Unrealized Gain 660 654
Unrealized Loss 0 0
Fair Value 36,827 23,623
Limited Partnership    
Other Investments    
Cost or adjusted/amortized cost 2,778 2,556
Unrealized Gain 639 573
Unrealized Loss 0 0
Fair Value of Limited Partnership Interest 3,417 3,129
Surplus Note    
Other Investments    
Cost or adjusted/amortized cost 6,000  
Unrealized Gain 0  
Unrealized Loss 0  
Fair Value 6,000  
Commercial Mortgage Loans    
Other Investments    
Cost or adjusted/amortized cost 6,840  
Unrealized Gain 0  
Unrealized Loss 0  
Fair Value 6,840  
Short-term Investments    
Other Investments    
Cost or adjusted/amortized cost 20,549 20,413
Unrealized Gain 21 81
Unrealized Loss 0 0
Fair Value $ 20,570 $ 20,494