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Investments - Securities In Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value $ 1,199,429 $ 694,898
12 Months or Greater - Fair Value 3,244,177 3,664,661
Total - Fair Value 4,443,606 4,359,559
Less Than 12 Months - Unrealized Losses (20,324) (12,254)
12 Months or Greater - Unrealized Losses (349,688) (353,890)
Total - Unrealized Losses $ (370,012) $ (366,144)
Number of securities in unrealized loss position (in securities) | security 1,103 1,021
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value $ 33,814 $ 26,550
12 Months or Greater - Fair Value 93,212 98,359
Total - Fair Value 127,026 124,909
Less Than 12 Months - Unrealized Losses (107) (75)
12 Months or Greater - Unrealized Losses (6,488) (6,289)
Total - Unrealized Losses (6,595) (6,364)
Obligations of U.S. states and political subdivisions    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 409,466 275,727
12 Months or Greater - Fair Value 1,248,976 1,200,533
Total - Fair Value 1,658,442 1,476,260
Less Than 12 Months - Unrealized Losses (3,795) (3,622)
12 Months or Greater - Unrealized Losses (187,479) (186,213)
Total - Unrealized Losses (191,274) (189,835)
Corporate debt securities    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 536,362 270,956
12 Months or Greater - Fair Value 1,408,161 1,604,021
Total - Fair Value 1,944,523 1,874,977
Less Than 12 Months - Unrealized Losses (7,400) (6,060)
12 Months or Greater - Unrealized Losses (121,940) (122,151)
Total - Unrealized Losses (129,340) (128,211)
ABS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 37,810 41,549
12 Months or Greater - Fair Value 57,455 62,611
Total - Fair Value 95,265 104,160
Less Than 12 Months - Unrealized Losses (1,079) (1,234)
12 Months or Greater - Unrealized Losses (1,457) (2,041)
Total - Unrealized Losses (2,536) (3,275)
RMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 101,418 44,867
12 Months or Greater - Fair Value 137,598 176,349
Total - Fair Value 239,016 221,216
Less Than 12 Months - Unrealized Losses (6,894) (872)
12 Months or Greater - Unrealized Losses (17,647) (19,784)
Total - Unrealized Losses (24,541) (20,656)
CMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 35,431 35,249
12 Months or Greater - Fair Value 236,798 244,216
Total - Fair Value 272,229 279,465
Less Than 12 Months - Unrealized Losses (946) (391)
12 Months or Greater - Unrealized Losses (13,557) (15,361)
Total - Unrealized Losses (14,503) (15,752)
CLOs    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 45,128 0
12 Months or Greater - Fair Value 58,231 274,729
Total - Fair Value 103,359 274,729
Less Than 12 Months - Unrealized Losses (103) 0
12 Months or Greater - Unrealized Losses (379) (1,408)
Total - Unrealized Losses (482) (1,408)
Foreign government debt    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 0 0
12 Months or Greater - Fair Value 3,746 3,843
Total - Fair Value 3,746 3,843
Less Than 12 Months - Unrealized Losses 0 0
12 Months or Greater - Unrealized Losses (741) (643)
Total - Unrealized Losses $ (741) $ (643)