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LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Liability for Claims and Claims Adjustment Expense |  |  |  |
CAT event losses | $ 0 | $ 7,722 | $ 27,016 | $ 17,722
Prior years | 3,047 | (689) | 7,265 | 4,712
Operating Segments |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Prior years |  |  | 5,919 | (109)
Operating Segments | Open Market |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
CAT event losses | 0 | 0 | 27,016 | 10,000
Prior years | (941) | 60 | 3,955 | 1,533
Operating Segments | Innovations |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
CAT event losses | 0 | 0 | 0 | 0
Prior years | $ 2,531 | $ (1,641) | 1,964 | (1,642)
Operating Segments | Reinsurance Contract [Axis]: Adverse Reserve Development | Open Market |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Prior years |  |  | 32,000 | 10,100
Operating Segments | Reinsurance Contract [Axis]: Adverse Reserve Development | Innovations |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Prior years |  |  | 2,300 | (400)
Operating Segments | Reinsurance Contract [Axis]: Favorable Reserve Development | Open Market |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Prior years |  |  | (28,000) | (8,500)
Operating Segments | Reinsurance Contract [Axis]: Favorable Reserve Development | Innovations |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Prior years |  |  | $ (400) | $ 2,100

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