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Investments - Schedule of Available-For-Sale Securities Disclosure (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost $ 8,476,078 $ 7,880,697  
Allowance for Credit Losses (31,948) (28,212) $ (45,721)
Unrealized Gains 53,285 50,076  
Unrealized Losses (370,081) (403,364)  
Fair Value 8,127,334 7,499,197  
U.S. government and government agencies      
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost 139,906 223,157  
Allowance for Credit Losses 0 0  
Unrealized Gains 2 139  
Unrealized Losses (19,753) (18,261)  
Fair Value 120,155 205,035  
Foreign government      
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost 10,656 11,140  
Allowance for Credit Losses (21) (35) (284)
Unrealized Gains 0 0  
Unrealized Losses (1,333) (1,302)  
Fair Value 9,302 9,803  
Obligations of states and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost 483,609 612,938  
Allowance for Credit Losses (570) (669) (1,024)
Unrealized Gains 550 2,623  
Unrealized Losses (32,359) (28,927)  
Fair Value 451,230 585,965  
Corporate securities      
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost 3,181,046 2,834,048  
Allowance for Credit Losses (14,924) (12,999) (30,330)
Unrealized Gains 25,259 28,078  
Unrealized Losses (123,201) (137,888)  
Fair Value 3,068,180 2,711,239  
CLO and other ABS      
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost 2,065,611 1,911,831  
Allowance for Credit Losses (4,889) (2,854) (2,375)
Unrealized Gains 22,116 11,855  
Unrealized Losses (49,689) (86,005)  
Fair Value 2,033,149 1,834,827  
RMBS      
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost 1,812,744 1,568,960  
Allowance for Credit Losses (11,544) (11,649) (11,597)
Unrealized Gains 3,880 6,023  
Unrealized Losses (112,722) (85,851)  
Fair Value 1,692,358 1,477,483  
CMBS      
Debt Securities, Available-for-sale [Line Items]      
Cost/ Amortized Cost 782,506 718,623  
Allowance for Credit Losses 0 (6) $ (111)
Unrealized Gains 1,478 1,358  
Unrealized Losses (31,024) (45,130)  
Fair Value $ 752,960 $ 674,845