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FAIR VALUE MEASUREMENTS - Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets    
Fixed maturities, available for sale $ 11,456,024 $ 12,313,200
Equity securities 563,950 655,675
Other investments 954,602 947,982
Short-term investments 70,385 31,063
Derivative instruments (refer to Note 5) 1,091 3,116
Total Assets 13,046,052 13,951,036
Liabilities    
Derivative Instruments 23,966 20,617
Cash settled awards 3,023 9,091
Total Liabilities 26,989 29,708
U.S. government and agency    
Assets    
Fixed maturities, available for sale 2,273,203 2,682,448
Non-U.S. government    
Assets    
Fixed maturities, available for sale 739,133 795,178
Corporate debt    
Assets    
Fixed maturities, available for sale 4,473,551 4,495,312
Agency RMBS    
Assets    
Fixed maturities, available for sale 935,837 1,074,589
CMBS    
Assets    
Fixed maturities, available for sale 1,159,385 1,248,191
Non-agency RMBS    
Assets    
Fixed maturities, available for sale 174,888 186,164
ABS    
Assets    
Fixed maturities, available for sale 1,534,005 1,622,480
Municipals    
Assets    
Fixed maturities, available for sale 166,022 208,838
Common stocks    
Assets    
Equity securities 1,509 1,364
Preferred stocks    
Assets    
Equity securities 191 179
Exchange-traded funds    
Assets    
Equity securities 320,256 336,815
Bond mutual funds    
Assets    
Equity securities 241,994 317,317
Hedge funds    
Assets    
Other investments 51,617 59,488
Direct lending funds    
Assets    
Other investments 276,211 289,867
Private equity funds    
Assets    
Other investments 260,596 249,974
Real estate funds    
Assets    
Other investments 245,823 238,222
CLO-Equities    
Assets    
Other investments 4,881 5,910
Other privately held investments    
Assets    
Other investments 115,474 104,521
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Fixed maturities, available for sale 2,226,233 2,632,541
Equity securities 321,956 338,358
Other investments 0 0
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 2,548,189 2,970,899
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 2,226,233 2,632,541
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 1,509 1,364
Quoted prices in active markets for identical assets (Level 1) | Preferred stocks    
Assets    
Equity securities 191 179
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds    
Assets    
Equity securities 320,256 336,815
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) | Hedge 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 9,168,901 9,637,765
Equity securities 241,994 317,317
Other investments 0 0
Short-term investments 70,385 31,063
Derivative instruments (refer to Note 5) 1,091 3,116
Total Assets 9,482,371 9,989,261
Liabilities    
Derivative Instruments 18,892 14,987
Cash settled awards 3,023 9,091
Total Liabilities 21,915 24,078
Significant other observable inputs (Level 2) | U.S. government and agency    
Assets    
Fixed maturities, available for sale 46,970 49,907
Significant other observable inputs (Level 2) | Non-U.S. government    
Assets    
Fixed maturities, available for sale 739,133 795,178
Significant other observable inputs (Level 2) | Corporate debt    
Assets    
Fixed maturities, available for sale 4,412,661 4,452,418
Significant other observable inputs (Level 2) | Agency RMBS    
Assets    
Fixed maturities, available for sale 935,837 1,074,589
Significant other observable inputs (Level 2) | CMBS    
Assets    
Fixed maturities, available for sale 1,159,385 1,248,191
Significant other observable inputs (Level 2) | Non-agency RMBS    
Assets    
Fixed maturities, available for sale 174,888 186,164
Significant other observable inputs (Level 2) | ABS    
Assets    
Fixed maturities, available for sale 1,534,005 1,622,480
Significant other observable inputs (Level 2) | Municipals    
Assets    
Fixed maturities, available for sale 166,022 208,838
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 241,994 317,317
Significant other observable inputs (Level 2) | Hedge 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 60,890 42,894
Equity securities 0 0
Other investments 120,355 110,431
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 181,245 153,325
Liabilities    
Derivative Instruments 5,074 5,630
Cash settled awards 0 0
Total Liabilities 5,074 5,630
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 60,890 42,894
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) | Hedge 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 4,881 5,910
Significant unobservable inputs (Level 3) | Other privately held investments    
Assets    
Other investments 115,474 104,521
Fair value based on NAV practical expedient    
Assets    
Other investments 834,247 837,551
Fair value based on NAV practical expedient | Hedge funds    
Assets    
Other investments 51,617 59,488
Fair value based on NAV practical expedient | Direct lending funds    
Assets    
Other investments 276,211 289,867
Fair value based on NAV practical expedient | Private equity funds    
Assets    
Other investments 260,596 249,974
Fair value based on NAV practical expedient | Real estate funds    
Assets    
Other investments $ 245,823 $ 238,222