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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 284 858
Fair value, less than 12 months $ 1,270,977 $ 3,463,314
Unrealized losses, less than 12 months $ (41,840) $ (312,320)
Number of securities, 12 months or greater | security 919 426
Fair value, 12 months or greater $ 3,491,960 $ 1,434,379
Unrealized losses, 12 months or greater $ (502,517) $ (269,173)
Number of securities, total | security 1,203 1,284
Fair value, total $ 4,762,937 $ 4,897,693
Unrealized losses, total $ (544,357) $ (581,493)
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 5 14
Fair value, less than 12 months $ 24,477 $ 86,964
Unrealized losses, less than 12 months $ (917) $ (21,370)
Number of securities, 12 months or greater | security 15 10
Fair value, 12 months or greater $ 105,578 $ 47,770
Unrealized losses, 12 months or greater $ (25,506) $ (7,532)
Number of securities, total | security 20 24
Fair value, total $ 130,055 $ 134,734
Unrealized losses, total $ (26,423) $ (28,902)
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 20 43
Fair value, less than 12 months $ 73,260 $ 116,285
Unrealized losses, less than 12 months $ (2,557) $ (14,231)
Number of securities, 12 months or greater | security 41 20
Fair value, 12 months or greater $ 68,825 $ 25,401
Unrealized losses, 12 months or greater $ (14,318) $ (7,708)
Number of securities, total | security 61 63
Fair value, total $ 142,085 $ 141,686
Unrealized losses, total $ (16,875) $ (21,939)
Corporate bonds and notes    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 151 411
Fair value, less than 12 months $ 674,480 $ 1,769,547
Unrealized losses, less than 12 months $ (23,598) $ (176,768)
Number of securities, 12 months or greater | security 415 203
Fair value, 12 months or greater $ 1,740,198 $ 701,936
Unrealized losses, 12 months or greater $ (301,899) $ (173,769)
Number of securities, total | security 566 614
Fair value, total $ 2,414,678 $ 2,471,483
Unrealized losses, total $ (325,497) $ (350,537)
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 39 124
Fair value, less than 12 months $ 295,011 $ 610,812
Unrealized losses, less than 12 months $ (10,636) $ (46,117)
Number of securities, 12 months or greater | security 144 59
Fair value, 12 months or greater $ 545,432 $ 261,370
Unrealized losses, 12 months or greater $ (84,549) $ (52,442)
Number of securities, total | security 183 183
Fair value, total $ 840,443 $ 872,182
Unrealized losses, total $ (95,185) $ (98,559)
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 20 108
Fair value, less than 12 months $ 57,961 $ 469,100
Unrealized losses, less than 12 months $ (2,617) $ (38,178)
Number of securities, 12 months or greater | security 130 55
Fair value, 12 months or greater $ 511,965 $ 121,277
Unrealized losses, 12 months or greater $ (56,169) $ (14,368)
Number of securities, total | security 150 163
Fair value, total $ 569,926 $ 590,377
Unrealized losses, total $ (58,786) $ (52,546)
CLO    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 5 94
Fair value, less than 12 months $ 12,461 $ 246,705
Unrealized losses, less than 12 months $ (47) $ (10,271)
Number of securities, 12 months or greater | security 139 61
Fair value, 12 months or greater $ 461,070 $ 245,584
Unrealized losses, 12 months or greater $ (15,815) $ (10,214)
Number of securities, total | security 144 155
Fair value, total $ 473,531 $ 492,289
Unrealized losses, total $ (15,862) $ (20,485)
Other ABS    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 44 61
Fair value, less than 12 months $ 133,327 $ 115,181
Unrealized losses, less than 12 months $ (1,468) $ (3,603)
Number of securities, 12 months or greater | security 34 18
Fair value, 12 months or greater $ 53,875 $ 31,041
Unrealized losses, 12 months or greater $ (4,155) $ (3,140)
Number of securities, total | security 78 79
Fair value, total $ 187,202 $ 146,222
Unrealized losses, total $ (5,623) $ (6,743)
Mortgage insurance-linked notes    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security   2
Fair value, less than 12 months   $ 43,745
Unrealized losses, less than 12 months   $ (1,639)
Number of securities, 12 months or greater | security   0
Fair value, 12 months or greater   $ 0
Unrealized losses, 12 months or greater   $ 0
Number of securities, total | security   2
Fair value, total   $ 43,745
Unrealized losses, total   $ (1,639)
Foreign government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 0 1
Fair value, less than 12 months $ 0 $ 4,975
Unrealized losses, less than 12 months $ 0 $ (143)
Number of securities, 12 months or greater | security 1 0
Fair value, 12 months or greater $ 5,017 $ 0
Unrealized losses, 12 months or greater $ (106) $ 0
Number of securities, total | security 1 1
Fair value, total $ 5,017 $ 4,975
Unrealized losses, total $ (106) $ (143)