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FAIR VALUE MEASUREMENTS (DETAILS) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities $ 11,986,327 $ 11,928,049
Equity securities 701,987 666,548
Other investments 1,045,810 843,437
Short-term investments 46,212 108,860
Derivative assets (see Note 7) 7,808 5,838
Derivative liabilities (see Note 7) 1,967 3,737
Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 11,986,327 11,928,049
Equity securities 701,987 666,548
Other investments 1,045,810 843,437
Short-term investments 46,212 108,860
Derivative assets (see Note 7) 7,808 5,838
Total assets 13,788,144 13,552,732
Derivative liabilities (see Note 7) 1,967 3,737
Cash settled awards (see Note 16) 8,693 0
Total liabilities 10,660 3,737
US Government and Agency [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,388,698 1,422,885
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 1,388,698 1,422,885
Non-US Government [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,176,382 1,104,576
Non-US Government [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,176,382 1,104,576
Corporate Debt [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 3,608,238 3,876,382
Corporate Debt [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 3,608,238 3,876,382
Agency RMBS [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,448,827 2,659,908
Agency RMBS [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,448,827 2,659,908
CMBS [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 797,414 840,084
CMBS [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 797,414 840,084
Non-Agency RMBS [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 67,567 95,199
Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 67,567 95,199
ABS [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 953,451 643,206
ABS [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 953,451 643,206
Municipals [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,545,750 1,285,809
Municipals [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,545,750 1,285,809
Common Stock [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 438,318 443,398
Common Stock [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 438,318 443,398
Exchange-Traded Funds [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 138,847 119,161
Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 138,847 119,161
Non-U.S. Bond Mutual Funds [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 124,822 103,989
Non-U.S. Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 124,822 103,989
Hedge funds [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 949,810 781,002
Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 22,134 0
CLO-Equities [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 73,866 62,435
Level 1 [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,119,632 1,094,220
Equity securities 577,165 562,559
Other investments 0 0
Short-term investments 0 0
Derivative assets (see Note 7) 0 0
Total assets 1,696,797 1,656,779
Derivative liabilities (see Note 7) 0 0
Cash settled awards (see Note 16) 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 1,119,632 1,094,220
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 438,318 443,398
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 138,847 119,161
Level 1 [Member] | Non-U.S. 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] | 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 10,831,878 10,762,898
Equity securities 124,822 103,989
Other investments 488,755 421,006
Short-term investments 46,212 108,860
Derivative assets (see Note 7) 6,824 5,838
Total assets 11,498,491 11,402,591
Derivative liabilities (see Note 7) 1,152 3,737
Cash settled awards (see Note 16) 8,693 0
Total liabilities 9,845 3,737
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 269,066 328,665
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 1,176,382 1,104,576
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 3,608,238 3,874,832
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 2,448,827 2,659,908
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 793,396 835,788
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 67,567 94,089
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 922,652 579,231
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 1,545,750 1,285,809
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] | Non-U.S. Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 124,822 103,989
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 488,755 421,006
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] | 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 34,817 70,931
Equity securities 0 0
Other investments 557,055 422,431
Short-term investments 0 0
Derivative assets (see Note 7) 984 0
Total assets 592,856 493,362
Derivative liabilities (see Note 7) 815 0
Cash settled awards (see Note 16) 0 0
Total liabilities 815 0
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 0 1,550
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 4,018 4,296
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 1,110
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 30,799 63,975
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] | Non-U.S. 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 461,055 359,996
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 22,134 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 $ 73,866 $ 62,435