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FAIR VALUE MEASUREMENTS - Fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities $ 11,435,347 $ 12,622,006
Equity securities 381,633 635,511
Other investments 787,787 1,009,373
Short-term investments 144,040 83,661
Derivative instruments 8,237 5,125
Insurance-linked securities   25,090
Total Assets 12,757,044 14,380,766
Net derivative assets 14,522 14,386
Cash settled awards 20,648 21,535
Total Liabilities 35,170 35,921
U.S. government and agency    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,515,697 1,712,469
Non-U.S. government    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 493,016 806,299
Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,876,921 5,297,866
Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,643,308 2,395,152
CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,092,530 777,728
Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 40,687 46,831
ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,637,603 1,436,281
Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 135,585 149,380
Common stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 527 25,658
Exchange-traded funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 236,839 427,633
Bond mutual funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 144,267 182,220
Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 194,598 363,811
Direct lending funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 274,478 250,681
Private equity funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 64,566 68,812
Real estate funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 84,202 50,009
Other privately held investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 44,518 46,430
CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 21,271 31,413
Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 104,154 198,217
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 1,480,466 1,658,622
Equity securities 237,366 453,291
Other investments 0 0
Short-term investments 0 0
Derivative instruments 0 0
Insurance-linked securities   0
Total Assets 1,717,832 2,111,913
Net derivative assets 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    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,480,466 1,658,622
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 527 25,658
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 236,839 427,633
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 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 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 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 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 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 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 0 0
Significant other observable inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 9,868,202 10,910,487
Equity securities 144,267 182,220
Other investments 104,154 198,217
Short-term investments 144,040 83,661
Derivative instruments 8,237 5,125
Insurance-linked securities   0
Total Assets 10,268,900 11,379,710
Net derivative assets 4,223 2,876
Cash settled awards 20,648 21,535
Total Liabilities 24,871 24,411
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 35,231 53,847
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 493,016 806,299
Significant other observable inputs (Level 2) | Corporate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,827,909 5,244,969
Significant other observable inputs (Level 2) | Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,643,308 2,395,152
Significant other observable inputs (Level 2) | CMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,073,396 777,728
Significant other observable inputs (Level 2) | Non-Agency RMBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 40,687 46,831
Significant other observable inputs (Level 2) | ABS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,619,070 1,436,281
Significant other observable inputs (Level 2) | Municipals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 135,585 149,380
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 144,267 182,220
Significant other observable inputs (Level 2) | Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 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 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 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 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 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 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 104,154 198,217
Significant unobservable inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 86,679 52,897
Equity securities 0 0
Other investments 65,789 77,843
Short-term investments 0 0
Derivative instruments 0 0
Insurance-linked securities   25,090
Total Assets 152,468 155,830
Net derivative assets 10,299 11,510
Cash settled awards 0 0
Total Liabilities 10,299 11,510
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 49,012 52,897
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 19,134 0
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 18,533 0
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 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 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 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 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 44,518 46,430
Significant unobservable inputs (Level 3) | CLO-Equities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 21,271 31,413
Significant unobservable inputs (Level 3) | Overseas deposits    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Fair value based on NAV practical expedient    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 617,844 733,313
Total Assets 617,844 733,313
Fair value based on NAV practical expedient | Hedge funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 194,598 363,811
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 274,478 250,681
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 64,566 68,812
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 84,202 50,009
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 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 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 $ 0 $ 0