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INVESTMENTS (DETAILS 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
security
Dec. 31, 2013
security
Fixed Maturities [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater $ 210,698 $ 271,520
Unrealized Losses - 12 months or greater (12,637) (13,466)
Fair Value - Less than 12 months 4,511,476 4,889,507
Unrealized Losses - Less than 12 months (101,070) (166,571)
Total Fair Value of Securities in Unrealized Loss Position 4,722,174 5,161,027
Total Unrealized Losses (113,707) (180,037)
Number of Available For Sale Securities In Unrealized Loss Positions 989 1,127
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater 95 99
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses (1,000) (2,000)
US Government and Agency [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 728 0
Unrealized Losses - 12 months or greater (15) 0
Fair Value - Less than 12 months 1,063,725 982,307
Unrealized Losses - Less than 12 months (24,250) (33,952)
Total Fair Value of Securities in Unrealized Loss Position 1,064,453 982,307
Total Unrealized Losses (24,265) (33,952)
Non-US Government [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 22,848 35,577
Unrealized Losses - 12 months or greater (5,881) (3,430)
Fair Value - Less than 12 months 394,175 420,622
Unrealized Losses - Less than 12 months (27,179) (46,562)
Total Fair Value of Securities in Unrealized Loss Position 417,023 456,199
Total Unrealized Losses (33,060) (49,992)
Corporate Debt [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 31,753 27,696
Unrealized Losses - 12 months or greater (640) (802)
Fair Value - Less than 12 months 633,852 606,592
Unrealized Losses - Less than 12 months (6,431) (9,426)
Total Fair Value of Securities in Unrealized Loss Position 665,605 634,288
Total Unrealized Losses (7,071) (10,228)
Agency RMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 45,701 144,468
Unrealized Losses - 12 months or greater (1,740) (5,247)
Fair Value - Less than 12 months 1,400,738 1,478,527
Unrealized Losses - Less than 12 months (30,219) (53,044)
Total Fair Value of Securities in Unrealized Loss Position 1,446,439 1,622,995
Total Unrealized Losses (31,959) (58,291)
CMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 12,170 13,319
Unrealized Losses - 12 months or greater (51) (116)
Fair Value - Less than 12 months 217,184 298,863
Unrealized Losses - Less than 12 months (2,156) (3,850)
Total Fair Value of Securities in Unrealized Loss Position 229,354 312,182
Total Unrealized Losses (2,207) (3,966)
Non-Agency RMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 7,259 4,287
Unrealized Losses - 12 months or greater (361) (315)
Fair Value - Less than 12 months 15,606 5,319
Unrealized Losses - Less than 12 months (93) (83)
Total Fair Value of Securities in Unrealized Loss Position 22,865 9,606
Total Unrealized Losses (454) (398)
ABS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 83,261 37,765
Unrealized Losses - 12 months or greater (3,575) (2,941)
Fair Value - Less than 12 months 526,622 553,803
Unrealized Losses - Less than 12 months (5,878) (5,753)
Total Fair Value of Securities in Unrealized Loss Position 609,883 591,568
Total Unrealized Losses (9,453) (8,694)
Municipals [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 6,978 8,408
Unrealized Losses - 12 months or greater (374) (615)
Fair Value - Less than 12 months 259,574 543,474
Unrealized Losses - Less than 12 months (4,864) (13,901)
Total Fair Value of Securities in Unrealized Loss Position 266,552 551,882
Total Unrealized Losses (5,238) (14,516)
Equity Securities [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 3,629 3,499
Unrealized Losses - 12 months or greater (732) (398)
Fair Value - Less than 12 months 68,886 48,828
Unrealized Losses - Less than 12 months (4,831) (5,785)
Total Fair Value of Securities in Unrealized Loss Position 72,515 52,327
Total Unrealized Losses (5,563) (6,183)
Number of Available For Sale Securities In Unrealized Loss Positions 66 63
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater 11 9
Common Stock [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 3,629 3,499
Unrealized Losses - 12 months or greater (732) (398)
Fair Value - Less than 12 months 55,684 48,828
Unrealized Losses - Less than 12 months (4,770) (5,785)
Total Fair Value of Securities in Unrealized Loss Position 59,313 52,327
Total Unrealized Losses (5,502) (6,183)
Exchange-Traded Funds [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 0 0
Unrealized Losses - 12 months or greater 0 0
Fair Value - Less than 12 months 13,202 0
Unrealized Losses - Less than 12 months (61) 0
Total Fair Value of Securities in Unrealized Loss Position 13,202 0
Total Unrealized Losses $ (61) $ 0