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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