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FAIR VALUE MEASUREMENTS - Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets    
Fixed maturities, available for sale $ 12,269,310 $ 12,234,742
Equity securities 582,178 588,511
Other investments 934,724 949,413
Short-term investments 75,879 17,216
Derivative instruments (refer to Note 5) 1,232 4,424
Total Assets 13,863,323 13,794,306
Liabilities    
Derivative instruments 2,282 10,165
Total Liabilities 2,282 10,165
U.S. government and agency    
Assets    
Fixed maturities, available for sale 2,593,717 3,007,528
Non-U.S. government    
Assets    
Fixed maturities, available for sale 738,198 723,959
Corporate debt    
Assets    
Fixed maturities, available for sale 4,915,938 4,474,172
Agency RMBS    
Assets    
Fixed maturities, available for sale 1,585,620 1,634,661
CMBS    
Assets    
Fixed maturities, available for sale 820,393 839,696
Non-agency RMBS    
Assets    
Fixed maturities, available for sale 139,992 153,396
ABS    
Assets    
Fixed maturities, available for sale 1,317,905 1,242,971
Municipals    
Assets    
Fixed maturities, available for sale 157,547 158,359
Common stocks    
Assets    
Equity securities 2,452 2,546
Preferred stocks    
Assets    
Equity securities 5,702 5,601
Exchange-traded funds    
Assets    
Equity securities 287,166 287,275
Bond mutual funds    
Assets    
Equity securities 286,858 293,089
Multi-strategy funds    
Assets    
Other investments 24,950 24,619
Direct lending funds    
Assets    
Other investments 168,987 192,270
Private equity funds    
Assets    
Other investments 309,399 301,712
Real estate funds    
Assets    
Other investments 309,545 317,325
CLO-Equities    
Assets    
Other investments 4,986 5,300
Other privately held investments    
Assets    
Other investments 116,857 108,187
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Fixed maturities, available for sale 2,576,715 2,989,612
Equity securities 289,620 289,822
Other investments 0 0
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 2,866,335 3,279,434
Liabilities    
Derivative instruments 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 2,576,715 2,989,612
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 2,452 2,546
Quoted prices in active markets for identical assets (Level 1) | Preferred stocks    
Assets    
Equity securities 2 1
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds    
Assets    
Equity securities 287,166 287,275
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 9,566,120 9,109,377
Equity securities 292,558 298,689
Other investments 0 0
Short-term investments 75,879 17,216
Derivative instruments (refer to Note 5) 1,232 4,424
Total Assets 9,935,789 9,429,706
Liabilities    
Derivative instruments 2,282 10,165
Total Liabilities 2,282 10,165
Significant other observable inputs (Level 2) | U.S. government and agency    
Assets    
Fixed maturities, available for sale 17,002 17,916
Significant other observable inputs (Level 2) | Non-U.S. government    
Assets    
Fixed maturities, available for sale 738,198 723,959
Significant other observable inputs (Level 2) | Corporate debt    
Assets    
Fixed maturities, available for sale 4,789,463 4,338,419
Significant other observable inputs (Level 2) | Agency RMBS    
Assets    
Fixed maturities, available for sale 1,585,620 1,634,661
Significant other observable inputs (Level 2) | CMBS    
Assets    
Fixed maturities, available for sale 820,393 839,696
Significant other observable inputs (Level 2) | Non-agency RMBS    
Assets    
Fixed maturities, available for sale 139,992 153,396
Significant other observable inputs (Level 2) | ABS    
Assets    
Fixed maturities, available for sale 1,317,905 1,242,971
Significant other observable inputs (Level 2) | Municipals    
Assets    
Fixed maturities, available for sale 157,547 158,359
Significant other observable inputs (Level 2) | Common stocks    
Assets    
Equity securities 0 0
Significant other observable inputs (Level 2) | Preferred stocks    
Assets    
Equity securities 5,700 5,600
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 286,858 293,089
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 126,475 135,753
Equity securities 0 0
Other investments 101,241 92,589
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 227,716 228,342
Liabilities    
Derivative instruments 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 126,475 135,753
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 4,986 5,300
Significant unobservable inputs (Level 3) | Other privately held investments    
Assets    
Other investments 96,255 87,289
Fair value based on NAV practical expedient    
Assets    
Other investments 833,483 856,824
Total Assets 833,483 856,824
Fair value based on NAV practical expedient | Multi-strategy funds    
Assets    
Other investments 24,950 24,619
Fair value based on NAV practical expedient | Direct lending funds    
Assets    
Other investments 168,987 192,270
Fair value based on NAV practical expedient | Private equity funds    
Assets    
Other investments 309,399 301,712
Fair value based on NAV practical expedient | Real estate funds    
Assets    
Other investments 309,545 317,325
Fair value based on NAV practical expedient | Other privately held investments    
Assets    
Other investments $ 20,602 $ 20,898