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INVESTMENTS (DETAILS 11) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]    
Fair Value (fixed maturities) $ 11,397,114 $ 11,719,749
Unrealized Losses (197,000) (230,000)
Equity securities 638,744 597,998
Equity Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized Losses (12,068) (8,989)
Non-US Government [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value (fixed maturities) 565,834 739,005
Unrealized Losses (49,654) (72,332)
Non-US Government [Member] | eurozone [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value (fixed maturities) 28,000 21,000
CMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value (fixed maturities) 666,237 1,083,298
Unrealized Losses $ (3,564) $ (9,182)
CMBS [Member] | Weighted Average [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Subordination percentage input for determining credit losses 36.00% 32.00%
Non-Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value (fixed maturities) $ 56,921 $ 101,008
Unrealized Losses (2,023) (973)
Non-Agency RMBS [Member] | Prime [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value (fixed maturities) 40,000 82,000
Non-Agency RMBS [Member] | Alt A [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value (fixed maturities) $ 10,000 $ 13,000