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FAIR VALUE MEASUREMENTS (Financial Instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities $ 12,522,955 $ 11,435,347
Equity securities 433,407 381,633
Other investments, at fair value 802,064 787,787
Short-term investments 32,421 144,040
Derivative instruments (refer to Note 5) 863 8,237
Total Assets 13,791,710 12,757,044
Derivative instruments (refer to Note 5) 12,948 14,522
Cash settled awards (refer to Note 8) 12,946 20,648
Total Liabilities 25,894 35,170
U.S. government and agency    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,317,427 1,515,697
Non-U.S. government    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 537,824 493,016
Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,945,585 4,876,921
Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,686,912 1,643,308
CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,184,268 1,092,530
Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 55,980 40,687
ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,600,771 1,637,603
Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 194,188 135,585
Common stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 257 527
Exchange-traded funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 273,269 236,839
Bond mutual funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 159,881 144,267
Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 195,649 194,598
Direct lending funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 273,864 274,478
Private equity funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 60,285 64,566
Real estate funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 134,763 84,202
Other privately held investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 28,452 44,518
CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 17,798 21,271
Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 91,253 104,154
Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,281,604 1,480,466
Equity securities 273,526 237,366
Other investments, at fair value 0 0
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 2,555,130 1,717,832
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    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,281,604 1,480,466
Quoted prices in active markets for identical assets (Level 1) | Non-U.S. government    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Quoted prices in active markets for identical assets (Level 1) | Common stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 257 527
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 273,269 236,839
Quoted prices in active markets for identical assets (Level 1) | Bond mutual funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Quoted prices in active markets for identical assets (Level 1) | Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) | Direct lending funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) | Private equity funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) | Real estate funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) | Other privately held investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) | CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) | Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant other observable inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 10,191,831 9,868,202
Equity securities 159,881 144,267
Other investments, at fair value 91,253 104,154
Short-term investments 32,421 144,040
Derivative instruments (refer to Note 5) 863 8,237
Total Assets 10,476,249 10,268,900
Derivative instruments (refer to Note 5) 2,686 4,223
Cash settled awards (refer to Note 8) 12,946 20,648
Total Liabilities 15,632 24,871
Significant other observable inputs (Level 2) | U.S. government and agency    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 35,823 35,231
Significant other observable inputs (Level 2) | Non-U.S. government    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 537,824 493,016
Significant other observable inputs (Level 2) | Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,906,448 4,827,909
Significant other observable inputs (Level 2) | Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,686,912 1,643,308
Significant other observable inputs (Level 2) | CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,174,376 1,073,396
Significant other observable inputs (Level 2) | Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 55,980 40,687
Significant other observable inputs (Level 2) | ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,600,280 1,619,070
Significant other observable inputs (Level 2) | Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 194,188 135,585
Significant other observable inputs (Level 2) | Common stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Significant other observable inputs (Level 2) | Exchange-traded funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Significant other observable inputs (Level 2) | Bond mutual funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 159,881 144,267
Significant other observable inputs (Level 2) | Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant other observable inputs (Level 2) | Direct lending funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant other observable inputs (Level 2) | Private equity funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant other observable inputs (Level 2) | Real estate funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant other observable inputs (Level 2) | Other privately held investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant other observable inputs (Level 2) | CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant other observable inputs (Level 2) | Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 91,253 104,154
Significant unobservable inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 49,520 86,679
Equity securities 0 0
Other investments, at fair value 46,250 65,789
Short-term investments 0 0
Derivative instruments (refer to Note 5) 0 0
Total Assets 95,770 152,468
Derivative instruments (refer to Note 5) 10,262 10,299
Cash settled awards (refer to Note 8) 0 0
Total Liabilities 10,262 10,299
Significant unobservable inputs (Level 3) | U.S. government and agency    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | Non-U.S. government    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 39,137 49,012
Significant unobservable inputs (Level 3) | Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 9,892 19,134
Significant unobservable inputs (Level 3) | Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 491 18,533
Significant unobservable inputs (Level 3) | Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Significant unobservable inputs (Level 3) | Common stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Significant unobservable inputs (Level 3) | Exchange-traded funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Significant unobservable inputs (Level 3) | Bond mutual funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Significant unobservable inputs (Level 3) | Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant unobservable inputs (Level 3) | Direct lending funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant unobservable inputs (Level 3) | Private equity funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant unobservable inputs (Level 3) | Real estate funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Significant unobservable inputs (Level 3) | Other privately held investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 28,452 44,518
Significant unobservable inputs (Level 3) | CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 17,798 21,271
Significant unobservable inputs (Level 3) | Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Fair value based on NAV practical expedient    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 664,561 617,844
Fair value based on NAV practical expedient | Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 195,649 194,598
Fair value based on NAV practical expedient | Direct lending funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 273,864 274,478
Fair value based on NAV practical expedient | Private equity funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 60,285 64,566
Fair value based on NAV practical expedient | Real estate funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 134,763 84,202
Fair value based on NAV practical expedient | Other privately held investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Fair value based on NAV practical expedient | CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 0 0
Fair value based on NAV practical expedient | Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value $ 0 $ 0