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INVESTMENTS (DETAILS 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
US Government and Agency [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 233,816 453,207
Unrealized Losses - Less than 12 months (134) (3,692)
Total Fair Value of Securities in Unrealized Loss Position 233,816 453,207
Total Unrealized Losses (134) (3,692)
Non-US Government [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 0 83,572
Unrealized Losses - 12 months or greater 0 (6,062)
Fair Value - Less than 12 months 786,034 302,431
Unrealized Losses - Less than 12 months (36,572) (7,697)
Total Fair Value of Securities in Unrealized Loss Position 786,034 386,003
Total Unrealized Losses (36,572) (13,759)
Corporate Debt [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 54,843 160,161
Unrealized Losses - 12 months or greater (2,437) (13,123)
Fair Value - Less than 12 months 1,228,479 1,087,683
Unrealized Losses - Less than 12 months (55,058) (22,973)
Total Fair Value of Securities in Unrealized Loss Position 1,283,322 1,247,844
Total Unrealized Losses (57,495) (36,096)
Agency RMBS [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 0 735
Unrealized Losses - 12 months or greater 0 (42)
Fair Value - Less than 12 months 105,059 1,308,690
Unrealized Losses - Less than 12 months (492) (20,660)
Total Fair Value of Securities in Unrealized Loss Position 105,059 1,309,425
Total Unrealized Losses (492) (20,702)
CMBS [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 5,155 1,164
Unrealized Losses - 12 months or greater (17) (59)
Fair Value - Less than 12 months 11,243 48,701
Unrealized Losses - Less than 12 months (246) (1,442)
Total Fair Value of Securities in Unrealized Loss Position 16,398 49,865
Total Unrealized Losses (263) (1,501)
Non-Agency RMBS [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 43,348 100,074
Unrealized Losses - 12 months or greater (8,127) (10,030)
Fair Value - Less than 12 months 85,053 57,095
Unrealized Losses - Less than 12 months (5,120) (1,515)
Total Fair Value of Securities in Unrealized Loss Position 128,401 157,169
Total Unrealized Losses (13,247) (11,545)
ABS [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 65,096 40,617
Unrealized Losses - 12 months or greater (9,497) (12,871)
Fair Value - Less than 12 months 201,569 155,491
Unrealized Losses - Less than 12 months (5,504) (2,179)
Total Fair Value of Securities in Unrealized Loss Position 266,665 196,108
Total Unrealized Losses (15,001) (15,050)
Municipals [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 8,450 23,681
Unrealized Losses - 12 months or greater (1,467) (3,118)
Fair Value - Less than 12 months 38,590 288,130
Unrealized Losses - Less than 12 months (213) (8,432)
Total Fair Value of Securities in Unrealized Loss Position 47,040 311,811
Total Unrealized Losses (1,680) (11,550)
Common Stock [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 4,445 4,347
Unrealized Losses - 12 months or greater (2,105) (601)
Fair Value - Less than 12 months 124,481 44,513
Unrealized Losses - Less than 12 months (17,186) (2,403)
Total Fair Value of Securities in Unrealized Loss Position 128,926 48,860
Total Unrealized Losses (19,291) (3,004)
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 212,050 0
Unrealized Losses - Less than 12 months (25,507) 0
Total Fair Value of Securities in Unrealized Loss Position 212,050 0
Total Unrealized Losses (25,507) 0
Foreign Bond Mutual Fund [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 116,124 77,804
Unrealized Losses - Less than 12 months (2,428) (1,710)
Total Fair Value of Securities in Unrealized Loss Position 116,124 77,804
Total Unrealized Losses (2,428) (1,710)
Fixed Maturities [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 176,892 410,004
Unrealized Losses - 12 months or greater (21,545) (45,305)
Fair Value - Less than 12 months 2,689,843 3,701,428
Unrealized Losses - Less than 12 months (103,339) (68,590)
Total Fair Value of Securities in Unrealized Loss Position 2,866,735 4,111,432
Total Unrealized Losses (124,884) (113,895)
Number of Available For Sale Securities In Unrealized Loss Positions 791 1,150
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater 138 206
Fixed Maturities [Member] | Below Investment Grade or Not Rated [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Total Unrealized Losses (18,000) (15,000)
Equities [Member]
   
Schedule Of Available For Sale Securities [Line Items]    
Fair Value - 12 months or greater 4,445 4,347
Unrealized Losses - 12 months or greater (2,105) (601)
Fair Value - Less than 12 months 452,655 122,317
Unrealized Losses - Less than 12 months (45,121) (4,113)
Total Fair Value of Securities in Unrealized Loss Position 457,100 126,664
Total Unrealized Losses $ (47,226) $ (4,714)
Number of Available For Sale Securities In Unrealized Loss Positions 128 71
Number of Available For Sale Securities in Unrealized Loss Positions for 12 Months or Greater 10 12