XML 58 R49.htm IDEA: XBRL DOCUMENT v3.23.3
Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 933,718 $ 3,463,314
Unrealized losses, less than 12 months (39,582) (312,320)
Fair value, 12 months or greater 3,867,561 1,434,379
Unrealized losses, 12 months or greater (627,775) (269,173)
Fair value, total 4,801,279 4,897,693
Unrealized losses, total $ (667,357) $ (581,493)
Number of securities in unrealized loss position | security 1,216 1,284
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 18,644 $ 86,964
Unrealized losses, less than 12 months (3,052) (21,370)
Fair value, 12 months or greater 106,409 47,770
Unrealized losses, 12 months or greater (33,330) (7,532)
Fair value, total 125,053 134,734
Unrealized losses, total (36,382) (28,902)
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 34,225 116,285
Unrealized losses, less than 12 months (2,994) (14,231)
Fair value, 12 months or greater 98,445 25,401
Unrealized losses, 12 months or greater (22,099) (7,708)
Fair value, total 132,670 141,686
Unrealized losses, total (25,093) (21,939)
Corporate bonds and notes    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 439,005 1,769,547
Unrealized losses, less than 12 months (18,372) (176,768)
Fair value, 12 months or greater 1,976,424 701,936
Unrealized losses, 12 months or greater (376,394) (173,769)
Fair value, total 2,415,429 2,471,483
Unrealized losses, total (394,766) (350,537)
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 201,321 610,812
Unrealized losses, less than 12 months (11,093) (46,117)
Fair value, 12 months or greater 628,227 261,370
Unrealized losses, 12 months or greater (124,241) (52,442)
Fair value, total 829,548 872,182
Unrealized losses, total (135,334) (98,559)
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 18,900 469,100
Unrealized losses, less than 12 months (272) (38,178)
Fair value, 12 months or greater 538,095 121,277
Unrealized losses, 12 months or greater (57,530) (14,368)
Fair value, total 556,995 590,377
Unrealized losses, total (57,802) (52,546)
CLO    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 14,841 246,705
Unrealized losses, less than 12 months (19) (10,271)
Fair value, 12 months or greater 445,391 245,584
Unrealized losses, 12 months or greater (8,950) (10,214)
Fair value, total 460,232 492,289
Unrealized losses, total (8,969) (20,485)
Other ABS    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 203,657 115,181
Unrealized losses, less than 12 months (3,774) (3,603)
Fair value, 12 months or greater 69,537 31,041
Unrealized losses, 12 months or greater (5,139) (3,140)
Fair value, total 273,194 146,222
Unrealized losses, total (8,913) (6,743)
Mortgage insurance-linked notes    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 3,125 43,745
Unrealized losses, less than 12 months (6) (1,639)
Fair value, 12 months or greater 0 0
Unrealized losses, 12 months or greater 0 0
Fair value, total 3,125 43,745
Unrealized losses, total (6) (1,639)
Foreign government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 0 4,975
Unrealized losses, less than 12 months 0 (143)
Fair value, 12 months or greater 5,033 0
Unrealized losses, 12 months or greater (92) 0
Fair value, total 5,033 4,975
Unrealized losses, total $ (92) $ (143)