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FAIR VALUE MEASUREMENTS - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Fixed maturities, available for sale | $ 11,627,555 | $ 11,326,894
Equity securities | 573,916 | 485,253
Other investments | 1,008,887 | 996,751
Short-term investments | 70,416 | 70,310
Derivative instruments (refer to Note 5) | 7,752 | 37,682
Total Assets | 13,288,526 | 12,916,890
Liabilities |  |
Derivative instruments | 2,789 | 703
Cash-settled awards | 0 | 4,792
Total Liabilities | 2,789 | 5,495
U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 2,901,312 | 2,639,330
Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 558,077 | 562,029
Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,297,212 | 4,255,556
Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,272,161 | 1,202,785
CMBS |  |
Assets |  |
Fixed maturities, available for sale | 923,503 | 947,778
Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 129,485 | 133,534
ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,397,383 | 1,429,527
Municipals |  |
Assets |  |
Fixed maturities, available for sale | 148,422 | 156,355
Common stocks |  |
Assets |  |
Equity securities | 3,014 | 7,473
Preferred stocks |  |
Assets |  |
Equity securities | 2 | 72
Exchange-traded funds |  |
Assets |  |
Equity securities | 279,719 | 269,806
Bond mutual funds |  |
Assets |  |
Equity securities | 291,181 | 207,902
Multi-strategy funds |  |
Assets |  |
Other investments | 30,721 | 32,616
Direct lending funds |  |
Assets |  |
Other investments | 258,183 | 258,626
Private equity funds |  |
Assets |  |
Other investments | 273,859 | 265,836
Real estate funds |  |
Assets |  |
Other investments | 300,152 | 298,499
CLO-Equities |  |
Assets |  |
Other investments | 5,019 | 5,016
Other privately held investments |  |
Assets |  |
Other investments | 140,953 | 136,158
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed maturities, available for sale | 2,862,087 | 2,600,636
Equity securities | 282,735 | 277,351
Other investments | 0 | 0
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 3,144,822 | 2,877,987
Liabilities |  |
Derivative instruments | 0 | 0
Cash-settled awards | 0 | 0
Total Liabilities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 2,862,087 | 2,600,636
Quoted prices in active markets for identical assets (Level 1) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Common stocks |  |
Assets |  |
Equity securities | 3,014 | 7,473
Quoted prices in active markets for identical assets (Level 1) | Preferred stocks |  |
Assets |  |
Equity securities | 2 | 72
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds |  |
Assets |  |
Equity securities | 279,719 | 269,806
Quoted prices in active markets for identical assets (Level 1) | Bond mutual funds |  |
Assets |  |
Equity securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Multi-strategy funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Direct lending funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Private equity funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Real estate funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | CLO-Equities |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Other privately held investments |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Fixed maturities, available for sale | 8,635,041 | 8,607,154
Equity securities | 291,181 | 207,902
Other investments | 0 | 0
Short-term investments | 70,416 | 70,310
Derivative instruments (refer to Note 5) | 7,752 | 37,682
Total Assets | 9,004,390 | 8,923,048
Liabilities |  |
Derivative instruments | 2,789 | 703
Cash-settled awards | 0 | 4,792
Total Liabilities | 2,789 | 5,495
Significant other observable inputs (Level 2) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 39,225 | 38,694
Significant other observable inputs (Level 2) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 558,077 | 562,029
Significant other observable inputs (Level 2) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,166,785 | 4,136,452
Significant other observable inputs (Level 2) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,272,161 | 1,202,785
Significant other observable inputs (Level 2) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 923,503 | 947,778
Significant other observable inputs (Level 2) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 129,485 | 133,534
Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,397,383 | 1,429,527
Significant other observable inputs (Level 2) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 148,422 | 156,355
Significant other observable inputs (Level 2) | Common stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant other observable inputs (Level 2) | Preferred stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant other observable inputs (Level 2) | Exchange-traded funds |  |
Assets |  |
Equity securities | 0 | 0
Significant other observable inputs (Level 2) | Bond mutual funds |  |
Assets |  |
Equity securities | 291,181 | 207,902
Significant other observable inputs (Level 2) | Multi-strategy funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Direct lending funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Private equity funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Real estate funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | CLO-Equities |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Other privately held investments |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed maturities, available for sale | 130,427 | 119,104
Equity securities | 0 | 0
Other investments | 145,972 | 141,174
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 276,399 | 260,278
Liabilities |  |
Derivative instruments | 0 | 0
Cash-settled awards | 0 | 0
Total Liabilities | 0 | 0
Significant unobservable inputs (Level 3) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 130,427 | 119,104
Significant unobservable inputs (Level 3) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Common stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Preferred stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Exchange-traded funds |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Bond mutual funds |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Multi-strategy funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | Direct lending funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | Private equity funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | Real estate funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | CLO-Equities |  |
Assets |  |
Other investments | 5,019 | 5,016
Significant unobservable inputs (Level 3) | Other privately held investments |  |
Assets |  |
Other investments | 140,953 | 136,158
Fair value based on NAV practical expedient |  |
Assets |  |
Other investments | 862,915 | 855,577
Total Assets | 862,915 | 855,577
Fair value based on NAV practical expedient | Multi-strategy funds |  |
Assets |  |
Other investments | 30,721 | 32,616
Fair value based on NAV practical expedient | Direct lending funds |  |
Assets |  |
Other investments | 258,183 | 258,626
Fair value based on NAV practical expedient | Private equity funds |  |
Assets |  |
Other investments | 273,859 | 265,836
Fair value based on NAV practical expedient | Real estate funds |  |
Assets |  |
Other investments | $ 300,152 | $ 298,499

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