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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 2,700,655 |  | $ 2,494,954
Other liabilities | (3,157) |  | (5,331)
Debt | 1,140,960 |  | 1,170,442
Long-term debt, fair value | 1,100,000 |  | 1,100,000
Net investment income | Term loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) recognized in earnings | 30,200 | $ (6,100) |
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 2,700,655 |  | 2,494,954
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 167,532 |  | 166,780
Other liabilities | (1,112) |  | (1,832)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 67,532 |  | 66,780
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Term loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 100,000 |  | 100,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | (1,112) |  | (1,832)
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Private equity funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 67,532 |  | 66,780
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Term loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 100,000 |  | 100,000
Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Miscellaneous other investments | $ 1,144,544 |  | $ 1,086,706
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.90% |  | 4.30%
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.90% |  | 6.30%
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 4.50% |  | 4.60%
Non-U.S. government |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 4.30% |  | 4.70%
Residential mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.20% |  | 5.40%
Weighted average life | 8 years 3 months 18 days |  | 8 years 7 months 6 days
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 8.40% |  | 7.40%
Weighted average life | 2 years 6 months |  | 3 years 2 months 12 days
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 7.50% |  | 7.40%
Weighted average life | 4 years 10 months 24 days |  | 5 years 2 months 12 days
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 4.10% |  | 4.00%
Other Short Term Investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 4.60% |  | 4.20%
Private credit funds | Minimum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 5 years |  |
Private credit funds | Maximum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 10 years |  |
Private credit funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Miscellaneous other investments | $ 806,495 |  | $ 771,383
Private equity funds | Minimum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 5 years |  |
Private equity funds | Maximum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 10 years |  |
Private equity funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Miscellaneous other investments | $ 338,049 |  | $ 315,323

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