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FAIR VALUE MEASUREMENTS (DETAILS) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities $ 12,139,595 $ 12,129,273
Equity securities 689,157 567,707
Other investments 800,319 965,465
Short-term investments 7,152 107,534
Derivative instruments (see Note 6) 2,608 7,264
Derivative instruments (see Note 6) 16,307 18,329
Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 12,139,595 12,129,273
Equity securities 689,157 567,707
Other investments 800,319 965,465
Short-term investments 7,152 107,534
Derivative instruments (see Note 6) 2,608 7,264
Insurance-linked securities 25,012 0
Total Assets 13,663,843 13,777,243
Derivative instruments (see Note 6) 16,307 18,329
Cash settled awards (see Note 8) 22,837 20,518
Total Liabilities 39,144 38,847
US Government and Agency [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,864,458 1,620,077
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 1,864,458 1,620,077
Non-US Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 772,714 1,033,543
Non-US Government [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 772,714 1,033,543
Corporate Debt [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,492,083 4,361,124
Corporate Debt [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,492,083 4,361,124
Agency RMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,207,708 2,278,108
Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,207,708 2,278,108
CMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,077,859 1,096,888
CMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,077,859 1,096,888
Non-Agency RMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 103,897 73,086
Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 103,897 73,086
ABS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,439,223 1,461,586
ABS [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,439,223 1,461,586
Municipals [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 181,653 204,861
Municipals [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 181,653 204,861
Exchange-Traded Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 567,393 454,890
Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 567,393 454,890
Bond Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 121,764 112,817
Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 121,764 112,817
Hedge Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 635,969 818,539
Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 79,283 54,438
Real Estate Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 4,369 0
CLO-Equities [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 80,698 92,488
Level 1 [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,834,673 1,497,922
Equity securities 567,393 454,890
Other investments 0 0
Short-term investments 0 0
Derivative instruments (see Note 6) 0 0
Insurance-linked securities 0 0
Total Assets 2,402,066 1,952,812
Derivative instruments (see Note 6) 0 0
Cash settled awards (see Note 8) 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 1,834,673 1,497,922
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] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 567,393 454,890
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] | 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] | 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 10,231,773 10,557,720
Equity securities 121,764 112,817
Other investments 156,839 347,621
Short-term investments 7,152 107,534
Derivative instruments (see Note 6) 2,573 7,153
Insurance-linked securities 0 0
Total Assets 10,520,101 11,132,845
Derivative instruments (see Note 6) 9,345 3,041
Cash settled awards (see Note 8) 22,837 20,518
Total Liabilities 32,182 23,559
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 29,785 122,155
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 772,714 1,033,543
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 4,430,359 4,345,287
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 2,207,708 2,278,108
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 1,066,541 1,079,125
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 103,897 73,086
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 1,439,116 1,421,555
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 181,653 204,861
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 121,764 112,817
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 156,839 347,621
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] | 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] | 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 73,149 73,631
Equity securities 0 0
Other investments 643,480 617,844
Short-term investments 0 0
Derivative instruments (see Note 6) 35 111
Insurance-linked securities 25,012 0
Total Assets 741,676 691,586
Derivative instruments (see Note 6) 6,962 15,288
Cash settled awards (see Note 8) 0 0
Total Liabilities 6,962 15,288
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 61,724 15,837
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 11,318 17,763
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 107 40,031
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] | 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 479,130 470,918
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 79,283 54,438
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 4,369 0
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 $ 80,698 $ 92,488