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FAIR VALUE MEASUREMENTS (DETAILS) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities $ 12,005,736 $ 12,129,273
Equity securities 659,181 567,707
Other investments 853,101 965,465
Short-term investments 30,618 107,534
Derivative instruments (see Note 6) 818 7,264
Derivative instruments (see Note 6) 6,739 18,329
Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 12,005,736 12,129,273
Equity securities 659,181 567,707
Other investments 853,101 965,465
Short-term investments 30,618 107,534
Derivative instruments (see Note 6) 818 7,264
Insurance-linked securities 24,837 0
Total Assets 13,574,291 13,777,243
Derivative instruments (see Note 6) 6,739 18,329
Cash settled awards (see Note 8) 19,939 20,518
Total Liabilities 26,678 38,847
US Government and Agency [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,683,109 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 1,683,109 1,620,077
Non-US Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 900,535 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 900,535 1,033,543
Corporate Debt [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 4,403,952 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 4,403,952 4,361,124
Agency RMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 2,134,976 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 2,134,976 2,278,108
CMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,099,570 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 1,099,570 1,096,888
Non-Agency RMBS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 101,274 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 101,274 73,086
ABS [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 1,427,061 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 1,427,061 1,461,586
Municipals [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 255,259 204,861
Municipals [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed maturities 255,259 204,861
Exchange-Traded Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 535,980 454,890
Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 535,980 454,890
Bond Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 123,201 112,817
Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities 123,201 112,817
Hedge Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 685,659 818,539
Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 73,628 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 3,000 0
CLO-Equities [Member] | Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 90,814 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 1,613,649 1,497,922
Equity securities 535,980 454,890
Other investments 0 0
Short-term investments 0 0
Derivative instruments (see Note 6) 0 0
Insurance-linked securities 0 0
Total Assets 2,149,629 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 1,613,649 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 535,980 454,890
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 10,327,069 10,557,720
Equity securities 123,201 112,817
Other investments 160,923 347,621
Short-term investments 30,618 107,534
Derivative instruments (see Note 6) 578 7,153
Insurance-linked securities 0 0
Total Assets 10,642,389 11,132,845
Derivative instruments (see Note 6) 5,921 3,041
Cash settled awards (see Note 8) 19,939 20,518
Total Liabilities 25,860 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 69,460 122,155
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 900,535 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 4,360,944 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 2,134,976 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 1,077,670 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 101,274 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 1,426,951 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 255,259 204,861
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 123,201 112,817
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 160,923 347,621
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 65,018 73,631
Equity securities 0 0
Other investments 692,178 617,844
Short-term investments 0 0
Derivative instruments (see Note 6) 240 111
Insurance-linked securities 24,837 0
Total Assets 782,273 691,586
Derivative instruments (see Note 6) 818 15,288
Cash settled awards (see Note 8) 0 0
Total Liabilities 818 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 43,008 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 21,900 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 110 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 524,736 470,918
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 73,628 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 3,000 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 $ 90,814 $ 92,488