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v3.23.3

Investments - Schedule of Fixed Maturity and Short-Term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | $ 2,077,885 | $ 1,633,814
Gross Unrealized Gains | 1,877 | 1,812
Gross Unrealized Losses | (99,323) | (90,039)
Investments, at fair value | 1,980,439 | 1,545,587
U.S. government treasuries |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 651,446 | 498,841
Gross Unrealized Gains | 21 | 99
Gross Unrealized Losses | (32,381) | (27,089)
Investments, at fair value | 619,086 | 471,851
U.S. states, territories and municipalities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 4,729 | 4,741
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (375) | (434)
Investments, at fair value | 4,354 | 4,307
Non-U.S. sovereign governments and supranationals |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 44,759 | 14,191
Gross Unrealized Gains | 413 | 363
Gross Unrealized Losses | (1,840) | (1,602)
Investments, at fair value | 43,332 | 12,952
Corporate |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 853,433 | 690,900
Gross Unrealized Gains | 81 | 363
Gross Unrealized Losses | (42,177) | (43,786)
Investments, at fair value | 811,337 | 647,477
Residential mortgage-backed securities - Agency |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 148,097 | 111,234
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (20,117) | (14,824)
Investments, at fair value | 127,980 | 96,410
Residential mortgage-backed securities - Non-agency |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 4,763 | 5,147
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (821) | (772)
Investments, at fair value | 3,944 | 4,375
Commercial mortgage-backed securities - Non-agency |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 10,188 | 10,283
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,295) | (1,064)
Investments, at fair value | 8,893 | 9,219
Other asset-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 12,847 | 13,347
Gross Unrealized Gains | 15 | 1
Gross Unrealized Losses | (317) | (463)
Investments, at fair value | 12,545 | 12,885
Total fixed maturities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 1,730,262 | 1,348,684
Gross Unrealized Gains | 532 | 826
Gross Unrealized Losses | (99,323) | (90,034)
Investments, at fair value | 1,631,471 | 1,259,476
Short-term investments |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 347,623 | 285,130
Gross Unrealized Gains | 1,345 | 986
Gross Unrealized Losses | 0 | (5)
Investments, at fair value | $ 348,968 | $ 286,111

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