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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Reserve for Claims and Claim Expenses by Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | $ 5,370,379 | $ 4,926,309 |
ACR | 2,326,254 | 2,200,627 |
IBNR | 15,217,130 | 14,176,555 |
Total | 22,913,763 | 21,303,491 | $ 20,740,928
Property | Operating Segments |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 2,067,007 | 1,845,228 |
ACR | 2,099,468 | 1,905,553 |
IBNR | 2,813,905 | 2,821,958 |
Total | 6,980,380 | 6,572,739 |
Casualty and Specialty | Operating Segments |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 3,303,372 | 3,081,081 |
ACR | 226,786 | 295,074 |
IBNR | 12,403,225 | 11,354,597 |
Total | $ 15,933,383 | $ 14,730,752 |

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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References No definition available. + Details
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