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FAIR VALUE MEASUREMENTS (Financial Instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities $ 11,739,305 $ 12,622,006
Other investments, at fair value 916,191 1,009,373
Short-term investments 168,944 83,661
Derivative instruments (see Note 5) 10,091 5,125
Derivative instruments (see Note 5) 15,745 14,386
U.S. government and agency    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,669,421 1,712,469
Non-U.S. government    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 585,163 806,299
Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,870,972 5,297,866
Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,699,728 2,395,152
CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,121,967 777,728
Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 39,304 46,831
ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,614,034 1,436,281
Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 138,716 149,380
Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative instruments (see Note 5) 10,589  
Fair Value Measurements Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 11,739,305 12,622,006
Equity securities 417,212 635,511
Other investments, at fair value 916,191 1,009,373
Short-term investments 168,944 83,661
Derivative instruments (see Note 5) 10,091 5,125
Insurance-linked securities   25,090
Total Assets 13,251,743 14,380,766
Derivative instruments (see Note 5) 15,745 14,386
Cash settled awards (see Note 8) 13,235 21,535
Total Liabilities 28,980 35,921
Fair Value Measurements Recurring | U.S. government and agency    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,669,421 1,712,469
Fair Value Measurements Recurring | Non-U.S. government    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 585,163 806,299
Fair Value Measurements Recurring | Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,870,972 5,297,866
Fair Value Measurements Recurring | Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,699,728 2,395,152
Fair Value Measurements Recurring | CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,121,967 777,728
Fair Value Measurements Recurring | Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 39,304 46,831
Fair Value Measurements Recurring | ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,614,034 1,436,281
Fair Value Measurements Recurring | Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 138,716 149,380
Fair Value Measurements Recurring | Common stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 13,427 25,658
Fair Value Measurements Recurring | Exchange-traded funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 263,845 427,633
Fair Value Measurements Recurring | Bond mutual funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 139,940 182,220
Fair Value Measurements Recurring | Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 343,714 363,811
Fair Value Measurements Recurring | Direct lending funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 259,976 250,681
Fair Value Measurements Recurring | Private equity funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 65,513 68,812
Fair Value Measurements Recurring | Real estate funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 56,855 50,009
Fair Value Measurements Recurring | Other privately held investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 47,613 46,430
Fair Value Measurements Recurring | CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 26,153 31,413
Fair Value Measurements Recurring | Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments, at fair value 116,367 198,217
Fair Value Measurements Recurring | 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 1,644,684 1,658,622
Equity securities 277,272 453,291
Other investments, at fair value 0 0
Short-term investments 0 0
Derivative instruments (see Note 5) 0 0
Insurance-linked securities   0
Total Assets 1,921,956 2,111,913
Derivative instruments (see Note 5) 0 0
Cash settled awards (see Note 8) 0 0
Total Liabilities 0 0
Fair Value Measurements Recurring | 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 1,644,684 1,658,622
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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 13,427 25,658
Fair Value Measurements Recurring | 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 263,845 427,633
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 10,033,016 10,910,487
Equity securities 139,940 182,220
Other investments, at fair value 116,367 198,217
Short-term investments 168,944 83,661
Derivative instruments (see Note 5) 10,091 5,125
Insurance-linked securities   0
Total Assets 10,468,358 11,379,710
Derivative instruments (see Note 5) 5,156 2,876
Cash settled awards (see Note 8) 13,235 21,535
Total Liabilities 18,391 24,411
Fair Value Measurements Recurring | 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 24,737 53,847
Fair Value Measurements Recurring | 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 585,163 806,299
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,828,419 5,244,969
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,699,728 2,395,152
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,103,818 777,728
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 38,401 46,831
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,614,034 1,436,281
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 138,716 149,380
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Bond mutual funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 139,940 182,220
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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 116,367 198,217
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 61,605 52,897
Equity securities 0 0
Other investments, at fair value 73,766 77,843
Short-term investments 0 0
Derivative instruments (see Note 5) 0 0
Insurance-linked securities   25,090
Total Assets 135,371 155,830
Derivative instruments (see Note 5) 10,589 11,510
Cash settled awards (see Note 8) 0 0
Total Liabilities 10,589 11,510
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 42,553 52,897
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 18,149 0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 903 0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Common stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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
Fair Value Measurements Recurring | 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 47,613 46,430
Fair Value Measurements Recurring | 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 26,153 31,413
Fair Value Measurements Recurring | 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 Measurements Recurring | 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 726,058 733,313
Fair Value Measurements Recurring | 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 343,714 363,811
Fair Value Measurements Recurring | 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 259,976 250,681
Fair Value Measurements Recurring | 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 65,513 68,812
Fair Value Measurements Recurring | 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 56,855 50,009
Fair Value Measurements Recurring | 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 Measurements Recurring | 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 Measurements Recurring | 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