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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities $ 11,086,386 $ 11,397,114
Equity securities 659,751 638,744
Other investments 830,253 830,219
Short-term investments 15,282 127,461
Derivative instruments 5,859 16,897
Derivative instruments 13,717 15,576
Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 11,086,386 11,397,114
Equity securities 659,751 638,744
Other investments 830,253 830,219
Short-term investments 15,282 127,461
Derivative instruments 5,859 16,897
Insurance-linked securities 24,976 25,023
Total Assets 12,622,507 13,035,458
Derivative instruments 13,717 15,576
Cash settled awards 18,369 48,432
Total Liabilities 32,086 64,008
US Government and Agency [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,547,318 1,656,069
US Government and Agency [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,547,318 1,656,069
Non-US Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 573,640 565,834
Non-US Government [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 573,640 565,834
Corporate Debt [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,503,967 4,600,743
Corporate Debt [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,503,967 4,600,743
Agency RMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,306,822 2,465,135
Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,306,822 2,465,135
CMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 669,736 666,237
CMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 669,736 666,237
Non-Agency RMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 43,817 56,921
Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 43,817 56,921
ABS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,288,870 1,222,214
ABS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,288,870 1,222,214
Municipals [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 152,216 163,961
Municipals [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 152,216 163,961
Common Stock [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 14,826 78
Common Stock [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 14,826 78
Exchange-Traded Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 454,194 514,707
Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 454,194 514,707
Bond Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 190,731 123,959
Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 190,731 123,959
Hedge Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 399,097 498,150
Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 232,389 134,650
Private Equity Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 71,896 81,223
Real Estate Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 46,691 13,354
Other Privately Held Investments [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 43,398 42,142
CLO-Equities [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 36,782 60,700
Fair value based on NAV practical expedient [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Equity securities 0 0
Other investments 750,073 727,377
Short-term investments 0 0
Derivative instruments 0 0
Insurance-linked securities 0 0
Total Assets 750,073 727,377
Derivative instruments 0 0
Cash settled awards 0 0
Total Liabilities 0 0
Fair value based on NAV practical expedient [Member] | US Government and Agency [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | Non-US Government [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | Corporate Debt [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | CMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | ABS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | Municipals [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Fair value based on NAV practical expedient [Member] | Common Stock [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Fair value based on NAV practical expedient [Member] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Fair value based on NAV practical expedient [Member] | Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Fair value based on NAV practical expedient [Member] | Hedge Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 399,097 498,150
Fair value based on NAV practical expedient [Member] | Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 232,389 134,650
Fair value based on NAV practical expedient [Member] | Private Equity Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 71,896 81,223
Fair value based on NAV practical expedient [Member] | Real Estate Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 46,691 13,354
Fair value based on NAV practical expedient [Member] | Other Privately Held Investments [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Fair value based on NAV practical expedient [Member] | CLO-Equities [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 1 [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,495,423 1,583,106
Equity securities 469,020 514,785
Other investments 0 0
Short-term investments 0 0
Derivative instruments 0 0
Insurance-linked securities 0 0
Total Assets 1,964,443 2,097,891
Derivative instruments 0 0
Cash settled awards 0 0
Total Liabilities 0 0
Level 1 [Member] | US Government and Agency [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,495,423 1,583,106
Level 1 [Member] | Non-US Government [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Corporate Debt [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | CMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | ABS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Municipals [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Common Stock [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 14,826 78
Level 1 [Member] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 454,194 514,707
Level 1 [Member] | Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 1 [Member] | Hedge Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 1 [Member] | Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 1 [Member] | Private Equity Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 1 [Member] | Real Estate Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 1 [Member] | Other Privately Held Investments [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 1 [Member] | CLO-Equities [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 2 [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 9,505,932 9,717,608
Equity securities 190,731 123,959
Other investments 0 0
Short-term investments 15,282 127,461
Derivative instruments 5,859 14,365
Insurance-linked securities 0 0
Total Assets 9,717,804 9,983,393
Derivative instruments 1,873 9,076
Cash settled awards 18,369 48,432
Total Liabilities 20,242 57,508
Level 2 [Member] | US Government and Agency [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 51,895 72,963
Level 2 [Member] | Non-US Government [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 573,640 565,834
Level 2 [Member] | Corporate Debt [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,442,951 4,524,868
Level 2 [Member] | Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,306,822 2,465,135
Level 2 [Member] | CMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 669,736 663,176
Level 2 [Member] | Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 43,817 56,921
Level 2 [Member] | ABS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,264,855 1,204,750
Level 2 [Member] | Municipals [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 152,216 163,961
Level 2 [Member] | Common Stock [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 2 [Member] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 2 [Member] | Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 190,731 123,959
Level 2 [Member] | Hedge Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 2 [Member] | Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 2 [Member] | Private Equity Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 2 [Member] | Real Estate Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 2 [Member] | Other Privately Held Investments [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 2 [Member] | CLO-Equities [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 3 [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 85,031 96,400
Equity securities 0 0
Other investments 80,180 102,842
Short-term investments 0 0
Derivative instruments 0 2,532
Insurance-linked securities 24,976 25,023
Total Assets 190,187 226,797
Derivative instruments 11,844 6,500
Cash settled awards 0 0
Total Liabilities 11,844 6,500
Level 3 [Member] | US Government and Agency [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 3 [Member] | Non-US Government [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 3 [Member] | Corporate Debt [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 61,016 75,875
Level 3 [Member] | Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 3 [Member] | CMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 3,061
Level 3 [Member] | Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 3 [Member] | ABS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 24,015 17,464
Level 3 [Member] | Municipals [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 0 0
Level 3 [Member] | Common Stock [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 3 [Member] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 3 [Member] | Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 3 [Member] | Hedge Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 3 [Member] | Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 3 [Member] | Private Equity Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 3 [Member] | Real Estate Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 0 0
Level 3 [Member] | Other Privately Held Investments [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 43,398 42,142
Level 3 [Member] | CLO-Equities [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments $ 36,782 $ 60,700