RESERVE FOR CLAIMS AND CLAIM EXPENSES - Additional Information (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||
| Total net (favorable) adverse development of prior accident years net claims and claim expenses | $ (1,090,933) | $ (851,334) | $ (450,607) |
| Other income (loss) | 4,321 | 1,928 | (6,152) |
| Net claim and claim expenses decrease | (5,615,839) | (5,332,981) | (3,573,509) |
| Reinsurance balances payable | |||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||
| Aggregate deposit liabilities | 3,300 | 3,500 | |
| Deposit Contracts, Underwriting Risk Only | |||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||
| Other income (loss) | $ 200 | $ 200 | |
| Net claim and claim expenses decrease | $ 200 | ||