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Summary of Investments - Fair Value of Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fixed maturities: |  |
Amortized Cost | $ 1,895,582 | $ 1,771,041
Gross Unrealized Gain | 2,299 | 6,810
Gross Unrealized Loss | 101,748 | 91,348
Allowance for Credit Losses | 0 | 1
Fair Value | 1,796,133 | 1,686,502
U.S. Treasury |  |
Fixed maturities: |  |
Amortized Cost | 51,211 | 51,211
Gross Unrealized Gain | 56 | 325
Gross Unrealized Loss | 618 | 675
Allowance for Credit Losses | 0 | 0
Fair Value | 50,649 | 50,861
U.S. government agency |  |
Fixed maturities: |  |
Amortized Cost | 97,438 | 102,540
Gross Unrealized Gain | 57 | 255
Gross Unrealized Loss | 9,154 | 8,302
Allowance for Credit Losses | 0 | 0
Fair Value | 88,341 | 94,493
General obligations | Midwest |  |
Fixed maturities: |  |
Amortized Cost | 38,918 | 52,712
Gross Unrealized Gain | 0 | 132
Gross Unrealized Loss | 469 | 137
Allowance for Credit Losses | 0 | 0
Fair Value | 38,449 | 52,707
General obligations | Northeast |  |
Fixed maturities: |  |
Amortized Cost | 7,121 | 11,422
Gross Unrealized Gain | 0 | 1
Gross Unrealized Loss | 122 | 43
Allowance for Credit Losses | 0 | 0
Fair Value | 6,999 | 11,380
General obligations | South |  |
Fixed maturities: |  |
Amortized Cost | 36,875 | 54,560
Gross Unrealized Gain | 0 | 47
Gross Unrealized Loss | 768 | 400
Allowance for Credit Losses | 0 | 0
Fair Value | 36,107 | 54,207
General obligations | West |  |
Fixed maturities: |  |
Amortized Cost | 58,789 | 77,874
Gross Unrealized Gain | 35 | 23
Gross Unrealized Loss | 939 | 471
Allowance for Credit Losses | 0 | 0
Fair Value | 57,885 | 77,426
Special revenue | Midwest |  |
Fixed maturities: |  |
Amortized Cost | 64,440 | 101,037
Gross Unrealized Gain | 2 | 302
Gross Unrealized Loss | 729 | 358
Allowance for Credit Losses | 0 | 0
Fair Value | 63,713 | 100,981
Special revenue | Northeast |  |
Fixed maturities: |  |
Amortized Cost | 50,012 | 52,708
Gross Unrealized Gain | 23 | 79
Gross Unrealized Loss | 767 | 560
Allowance for Credit Losses | 0 | 0
Fair Value | 49,268 | 52,227
Special revenue | South |  |
Fixed maturities: |  |
Amortized Cost | 121,547 | 166,119
Gross Unrealized Gain | 21 | 302
Gross Unrealized Loss | 2,932 | 2,155
Allowance for Credit Losses | 0 | 0
Fair Value | 118,636 | 164,266
Special revenue | West |  |
Fixed maturities: |  |
Amortized Cost | 86,246 | 102,254
Gross Unrealized Gain | 8 | 147
Gross Unrealized Loss | 1,485 | 836
Allowance for Credit Losses | 0 | 0
Fair Value | 84,769 | 101,565
Foreign bonds |  |
Fixed maturities: |  |
Amortized Cost | 16,210 | 21,255
Gross Unrealized Gain | 11 | 0
Gross Unrealized Loss | 1,083 | 2,083
Allowance for Credit Losses | 0 | 0
Fair Value | 15,138 | 19,172
Public utilities |  |
Fixed maturities: |  |
Amortized Cost | 141,202 | 149,734
Gross Unrealized Gain | 286 | 787
Gross Unrealized Loss | 10,720 | 10,054
Allowance for Credit Losses | 0 | 0
Fair Value | 130,768 | 140,467
Corporate bonds | Energy |  |
Fixed maturities: |  |
Amortized Cost | 41,879 | 45,351
Gross Unrealized Gain | 3 | 249
Gross Unrealized Loss | 2,245 | 2,127
Allowance for Credit Losses | 0 | 0
Fair Value | 39,637 | 43,473
Corporate bonds | Industrials |  |
Fixed maturities: |  |
Amortized Cost | 58,647 | 74,760
Gross Unrealized Gain | 86 | 727
Gross Unrealized Loss | 5,011 | 4,939
Allowance for Credit Losses | 0 | 0
Fair Value | 53,722 | 70,548
Corporate bonds | Consumer goods and services |  |
Fixed maturities: |  |
Amortized Cost | 101,945 | 103,315
Gross Unrealized Gain | 52 | 271
Gross Unrealized Loss | 8,675 | 7,665
Allowance for Credit Losses | 0 | 0
Fair Value | 93,322 | 95,921
Corporate bonds | Health care |  |
Fixed maturities: |  |
Amortized Cost | 31,795 | 37,872
Gross Unrealized Gain | 0 | 99
Gross Unrealized Loss | 4,939 | 4,499
Allowance for Credit Losses | 0 | 0
Fair Value | 26,856 | 33,472
Corporate bonds | Technology, media and telecommunications |  |
Fixed maturities: |  |
Amortized Cost | 82,279 | 87,002
Gross Unrealized Gain | 0 | 451
Gross Unrealized Loss | 7,305 | 5,665
Allowance for Credit Losses | 0 | 0
Fair Value | 74,974 | 81,788
Corporate bonds | Financial services |  |
Fixed maturities: |  |
Amortized Cost | 233,099 | 152,329
Gross Unrealized Gain | 852 | 743
Gross Unrealized Loss | 6,379 | 7,381
Allowance for Credit Losses | 0 | 1
Fair Value | 227,572 | 145,690
Mortgage-backed securities |  |
Fixed maturities: |  |
Amortized Cost | 219,159 | 23,800
Gross Unrealized Gain | 500 | 11
Gross Unrealized Loss | 3,380 | 2,328
Allowance for Credit Losses | 0 | 0
Fair Value | 216,279 | 21,483
Collateralized mortgage obligations | Government National Mortgage Association |  |
Fixed maturities: |  |
Amortized Cost | 151,577 | 164,666
Gross Unrealized Gain | 161 | 1,282
Gross Unrealized Loss | 14,138 | 12,742
Allowance for Credit Losses | 0 | 0
Fair Value | 137,600 | 153,206
Collateralized mortgage obligations | Federal Home Loan Mortgage Corporation |  |
Fixed maturities: |  |
Amortized Cost | 79,811 | 84,842
Gross Unrealized Gain | 0 | 20
Gross Unrealized Loss | 14,502 | 13,177
Allowance for Credit Losses | 0 | 0
Fair Value | 65,309 | 71,685
Collateralized mortgage obligations | Federal National Mortgage Association |  |
Fixed maturities: |  |
Amortized Cost | 46,395 | 50,284
Gross Unrealized Gain | 23 | 33
Gross Unrealized Loss | 5,201 | 4,664
Allowance for Credit Losses | 0 | 0
Fair Value | 41,217 | 45,653
Asset-backed securities |  |
Fixed maturities: |  |
Amortized Cost | 78,987 | 3,394
Gross Unrealized Gain | 123 | 524
Gross Unrealized Loss | 187 | 87
Allowance for Credit Losses | 0 | 0
Fair Value | $ 78,923 | $ 3,831

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