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Investments - Securities In Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
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Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 530,885 | $ 694,898
12 Months or Greater - Fair Value | 2,885,956 | 3,664,661
Total - Fair Value | 3,416,841 | 4,359,559
Less Than 12 Months - Unrealized Losses | (11,146) | (12,254)
12 Months or Greater - Unrealized Losses | (248,898) | (353,890)
Total - Unrealized Losses | $ (260,044) | $ (366,144)
Number of securities in unrealized loss position (in securities) | security | 851 | 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 | $ 11,859 | $ 26,550
12 Months or Greater - Fair Value | 78,089 | 98,359
Total - Fair Value | 89,948 | 124,909
Less Than 12 Months - Unrealized Losses | (42) | (75)
12 Months or Greater - Unrealized Losses | (3,977) | (6,289)
Total - Unrealized Losses | (4,019) | (6,364)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 94,516 | 275,727
12 Months or Greater - Fair Value | 1,235,787 | 1,200,533
Total - Fair Value | 1,330,303 | 1,476,260
Less Than 12 Months - Unrealized Losses | (1,481) | (3,622)
12 Months or Greater - Unrealized Losses | (143,409) | (186,213)
Total - Unrealized Losses | (144,890) | (189,835)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 240,691 | 270,956
12 Months or Greater - Fair Value | 1,152,482 | 1,604,021
Total - Fair Value | 1,393,173 | 1,874,977
Less Than 12 Months - Unrealized Losses | (4,040) | (6,060)
12 Months or Greater - Unrealized Losses | (79,965) | (122,151)
Total - Unrealized Losses | (84,005) | (128,211)
ABS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 43,761 | 41,549
12 Months or Greater - Fair Value | 26,459 | 62,611
Total - Fair Value | 70,220 | 104,160
Less Than 12 Months - Unrealized Losses | (852) | (1,234)
12 Months or Greater - Unrealized Losses | (545) | (2,041)
Total - Unrealized Losses | (1,397) | (3,275)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 53,033 | 44,867
12 Months or Greater - Fair Value | 168,955 | 176,349
Total - Fair Value | 221,988 | 221,216
Less Than 12 Months - Unrealized Losses | (4,602) | (872)
12 Months or Greater - Unrealized Losses | (13,614) | (19,784)
Total - Unrealized Losses | (18,216) | (20,656)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 4,829 | 35,249
12 Months or Greater - Fair Value | 220,234 | 244,216
Total - Fair Value | 225,063 | 279,465
Less Than 12 Months - Unrealized Losses | (76) | (391)
12 Months or Greater - Unrealized Losses | (6,851) | (15,361)
Total - Unrealized Losses | (6,927) | (15,752)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 82,196 | 0
12 Months or Greater - Fair Value | 0 | 274,729
Total - Fair Value | 82,196 | 274,729
Less Than 12 Months - Unrealized Losses | (53) | 0
12 Months or Greater - Unrealized Losses | 0 | (1,408)
Total - Unrealized Losses | (53) | (1,408)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 0 | 0
12 Months or Greater - Fair Value | 3,950 | 3,843
Total - Fair Value | 3,950 | 3,843
Less Than 12 Months - Unrealized Losses | 0 | 0
12 Months or Greater - Unrealized Losses | (537) | (643)
Total - Unrealized Losses | $ (537) | $ (643)

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