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FAIR VALUE MEASUREMENTS (Financial Instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Assets    
Fixed maturities $ 12,076,186 $ 12,468,205
Equity securities 404,945 474,207
Other investments 797,808 770,923
Short-term investments 77,101 38,471
Derivative instruments (refer to Note 5) 8,956 3,174
Total Assets 13,364,996 13,754,980
Liabilities    
Derivative instruments (refer to Note 5) 22,245 13,637
Cash settled awards (refer to Note 8) 5,711 21,731
Total Liabilities 27,956 35,368
U.S. government and agency    
Assets    
Fixed maturities 1,866,140 2,112,881
Non-U.S. government    
Assets    
Fixed maturities 598,641 576,592
Corporate debt    
Assets    
Fixed maturities 4,779,752 4,930,254
Agency RMBS    
Assets    
Fixed maturities 1,616,510 1,592,584
CMBS    
Assets    
Fixed maturities 1,428,683 1,365,052
Non-agency RMBS    
Assets    
Fixed maturities 123,011 84,922
ABS    
Assets    
Fixed maturities 1,445,179 1,598,693
Municipals    
Assets    
Fixed maturities 218,270 207,227
Common stocks    
Assets    
Equity securities 118 193
Preferred shares    
Assets    
Equity securities 7,308 0
Exchange-traded funds    
Assets    
Equity securities 222,343 297,325
Bond mutual funds    
Assets    
Equity securities 175,176 176,689
Hedge funds    
Assets    
Other investments 162,377 167,790
Direct lending funds    
Assets    
Other investments 289,952 277,395
Private equity funds    
Assets    
Other investments 83,693 80,412
Real estate funds    
Assets    
Other investments 157,039 130,112
Other privately held investments    
Assets    
Other investments 37,441 36,934
CLO-Equities    
Assets    
Other investments 12,793 14,328
Overseas deposits    
Assets    
Other investments 54,513 63,952
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Fixed maturities 1,787,049 2,053,622
Equity securities 229,769 297,518
Other investments 0 0
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 2,016,818 2,351,140
Liabilities    
Derivative instruments (refer to Note 5) 0 0
Cash settled awards (refer to Note 8) 0 0
Total Liabilities 0 0
Quoted prices in active markets for identical assets (Level 1) | U.S. government and agency    
Assets    
Fixed maturities 1,787,049 2,053,622
Quoted prices in active markets for identical assets (Level 1) | Non-U.S. government    
Assets    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Corporate debt    
Assets    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Agency RMBS    
Assets    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | CMBS    
Assets    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Non-agency RMBS    
Assets    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | ABS    
Assets    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Municipals    
Assets    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Common stocks    
Assets    
Equity securities 118 193
Quoted prices in active markets for identical assets (Level 1) | Preferred shares    
Assets    
Equity securities 7,308  
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds    
Assets    
Equity securities 222,343 297,325
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) | Other privately held investments    
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) | Overseas deposits    
Assets    
Other investments 0 0
Significant other observable inputs (Level 2)    
Assets    
Fixed maturities 10,273,000 10,406,562
Equity securities 175,176 176,689
Other investments 54,513 63,952
Short-term investments 77,101 38,471
Derivative instruments (refer to Note 5) 8,956 3,174
Total Assets 10,588,746 10,688,848
Liabilities    
Derivative instruments (refer to Note 5) 2,081 3,965
Cash settled awards (refer to Note 8) 5,711 21,731
Total Liabilities 7,792 25,696
Significant other observable inputs (Level 2) | U.S. government and agency    
Assets    
Fixed maturities 79,091 59,259
Significant other observable inputs (Level 2) | Non-U.S. government    
Assets    
Fixed maturities 598,641 576,592
Significant other observable inputs (Level 2) | Corporate debt    
Assets    
Fixed maturities 4,777,507 4,927,957
Significant other observable inputs (Level 2) | Agency RMBS    
Assets    
Fixed maturities 1,616,510 1,592,584
Significant other observable inputs (Level 2) | CMBS    
Assets    
Fixed maturities 1,424,312 1,359,817
Significant other observable inputs (Level 2) | Non-agency RMBS    
Assets    
Fixed maturities 113,826 84,922
Significant other observable inputs (Level 2) | ABS    
Assets    
Fixed maturities 1,444,843 1,598,204
Significant other observable inputs (Level 2) | Municipals    
Assets    
Fixed maturities 218,270 207,227
Significant other observable inputs (Level 2) | Common stocks    
Assets    
Equity securities 0 0
Significant other observable inputs (Level 2) | Preferred shares    
Assets    
Equity securities 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 175,176 176,689
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) | Other privately held investments    
Assets    
Other investments 0 0
Significant other observable inputs (Level 2) | CLO-Equities    
Assets    
Other investments 0 0
Significant other observable inputs (Level 2) | Overseas deposits    
Assets    
Other investments 54,513 63,952
Significant unobservable inputs (Level 3)    
Assets    
Fixed maturities 16,137 8,021
Equity securities 0 0
Other investments 50,234 51,262
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 66,371 59,283
Liabilities    
Derivative instruments (refer to Note 5) 20,164 9,672
Cash settled awards (refer to Note 8) 0 0
Total Liabilities 20,164 9,672
Significant unobservable inputs (Level 3) | U.S. government and agency    
Assets    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | Non-U.S. government    
Assets    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | Corporate debt    
Assets    
Fixed maturities 2,245 2,297
Significant unobservable inputs (Level 3) | Agency RMBS    
Assets    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | CMBS    
Assets    
Fixed maturities 4,371 5,235
Significant unobservable inputs (Level 3) | Non-agency RMBS    
Assets    
Fixed maturities 9,185 0
Significant unobservable inputs (Level 3) | ABS    
Assets    
Fixed maturities 336 489
Significant unobservable inputs (Level 3) | Municipals    
Assets    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | Common stocks    
Assets    
Equity securities 0 0
Significant unobservable inputs (Level 3) | Preferred shares    
Assets    
Equity securities 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) | Other privately held investments    
Assets    
Other investments 37,441 36,934
Significant unobservable inputs (Level 3) | CLO-Equities    
Assets    
Other investments 12,793 14,328
Significant unobservable inputs (Level 3) | Overseas deposits    
Assets    
Other investments 0 0
Fair value based on NAV practical expedient    
Assets    
Other investments 693,061 655,709
Fair value based on NAV practical expedient | Hedge funds    
Assets    
Other investments 162,377 167,790
Fair value based on NAV practical expedient | Direct lending funds    
Assets    
Other investments 289,952 277,395
Fair value based on NAV practical expedient | Private equity funds    
Assets    
Other investments 83,693 80,412
Fair value based on NAV practical expedient | Real estate funds    
Assets    
Other investments $ 157,039 $ 130,112