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v3.23.1

Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,979,045 | $ 5,926,785
Fair Value | 5,564,053 | 5,409,698
Assets held by insurance regulatory requirements | 12,100 | 11,800
Assets held in trust for the benefit of contractual counterparties | 130,700 | 128,400
Total fixed income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,979,045 | 5,926,785
Gross Unrealized Gains | 11,585 | 5,953
Gross Unrealized Losses | (426,577) | (523,040)
Fair Value | 5,564,053 | 5,409,698
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 223,428 | 145,581
Gross Unrealized Gains | 31 | 2
Gross Unrealized Losses | (7,713) | (9,683)
Fair Value | 215,746 | 135,900
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,403,603 | 2,400,261
Gross Unrealized Gains | 9,776 | 4,866
Gross Unrealized Losses | (201,039) | (256,073)
Fair Value | 2,212,340 | 2,149,054
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,341,134 | 2,416,475
Gross Unrealized Gains | 1,733 | 1,043
Gross Unrealized Losses | (164,925) | (196,377)
Fair Value | 2,177,942 | 2,221,141
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 124,175 | 126,723
Gross Unrealized Gains | 15 | 5
Gross Unrealized Losses | (4,819) | (6,041)
Fair Value | 119,371 | 120,687
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 217,751 | 223,743
Gross Unrealized Gains | 10 | 10
Gross Unrealized Losses | (22,256) | (25,744)
Fair Value | 195,505 | 198,009
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 250,589 | 257,785
Gross Unrealized Gains | 20 | 22
Gross Unrealized Losses | (18,704) | (20,591)
Fair Value | 231,905 | 237,216
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 337,033 | 337,656
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | (6,459) | (7,829)
Fair Value | 330,574 | 329,832
Foreign government debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,486 | 4,486
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (659) | (699)
Fair Value | 3,827 | 3,787
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 76,846 | 14,075
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3) | (3)
Fair Value | $ 76,843 | $ 14,072

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