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INVESTMENTS (Details 6) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale    
Amortized Cost $ 1,649,897 $ 1,534,637
Fair Value 1,858,706 1,754,370
Gross Unrealized Gains 237,742 220,991
Gross Unrealized Losses (28,933) (1,258)
Held-to-maturity    
Amortized Cost 651 11,728
Fair Value 687 11,868
Gross Unrecognized Gains 36 140
Trading securities    
Amortized Cost   6
Fair Value   7
Total fixed income and equity securities    
Amortized Cost 1,650,548 1,546,371
Fair Value 1,859,393 1,766,245
Gross Unrealized Gains 237,778 221,131
Gross Unrealized Losses (28,933) (1,258)
U.S. government
   
Available-for-sale    
Amortized Cost 17,086 16,358
Fair Value 17,303 16,713
Gross Unrealized Gains 217 355
U.S. Agency
   
Available-for-sale    
Amortized Cost 10,513 11,609
Fair Value 10,298 11,759
Gross Unrealized Gains 22 150
Gross Unrealized Losses (237)  
Held-to-maturity    
Amortized Cost   10,076
Fair Value   10,150
Gross Unrecognized Gains   74
Non-U.S. govt. & agency
   
Available-for-sale    
Amortized Cost 13,306 8,410
Fair Value 13,678 9,367
Gross Unrealized Gains 437 957
Gross Unrealized Losses (65)  
Mtge/ABS/CMBS
   
Available-for-sale    
Amortized Cost 350,187 307,310
Fair Value 350,725 327,716
Gross Unrealized Gains 8,188 20,406
Gross Unrealized Losses (7,650)  
Percentage of securities of portfolio rated with highest credit rating by by one or more major rating agency 99.00%  
Corporate
   
Available-for-sale    
Amortized Cost 511,748 535,437
Fair Value 526,038 580,708
Gross Unrealized Gains 22,302 45,497
Gross Unrealized Losses (8,012) (226)
Municipal
   
Available-for-sale    
Amortized Cost 528,209 415,226
Fair Value 522,010 432,319
Gross Unrealized Gains 6,495 17,250
Gross Unrealized Losses (12,694) (157)
Percentage of securities of portfolio rated as AA or better 91.00%  
Percentage of securities of portfolio rated as A or better 99.00%  
Held-to-maturity    
Amortized Cost 651 1,652
Fair Value 687 1,718
Gross Unrecognized Gains 36 66
Total fixed income
   
Available-for-sale    
Amortized Cost 1,431,049 1,294,350
Fair Value 1,440,052 1,378,582
Gross Unrealized Gains 37,661 84,615
Gross Unrealized Losses (28,658) (383)
Equity securities
   
Available-for-sale    
Amortized Cost 21,848 240,287
Fair Value 418,654 375,788
Gross Unrealized Gains 200,081 136,376
Gross Unrealized Losses $ (275) $ (875)