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INVESTMENTS - Investments In Fixed Income Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale    
Amortized Cost $ 1,720,593 $ 1,641,739
Fair Value 1,913,534 1,905,729
Gross Unrealized Gains 212,193 271,109
Gross Unrealized Losses (19,252) (7,119)
Total fixed income and equity securities    
Amortized Cost 1,720,593 1,641,739
Fair Value 1,913,534 1,905,729
Gross Unrealized Gains 212,193 271,109
Gross Unrealized Losses (19,252) (7,119)
U.S. government    
Available-for-sale    
Amortized Cost 43,597 33,668
Fair Value 43,543 33,788
Gross Unrealized Gains 58 131
Gross Unrealized Losses (112) (11)
U.S. Agency    
Available-for-sale    
Amortized Cost 15,481 6,385
Fair Value 15,740 6,747
Gross Unrealized Gains 306 362
Gross Unrealized Losses (47)  
Non-U.S. govt. & agency    
Available-for-sale    
Amortized Cost 5,035 9,862
Fair Value 4,478 10,665
Gross Unrealized Gains   803
Gross Unrealized Losses (557)  
Mtge/ABS/CMO    
Available-for-sale    
Gross Unrealized Losses 2,200  
Agency MBS    
Available-for-sale    
Amortized Cost 250,060 256,443
Fair Value 254,892 264,468
Gross Unrealized Gains 6,451 9,401
Gross Unrealized Losses (1,619) (1,376)
ABS/CMBS    
Available-for-sale    
Amortized Cost 91,559 133,894
Fair Value 91,948 135,304
Gross Unrealized Gains 995 1,821
Gross Unrealized Losses (606) (411)
Corporate    
Available-for-sale    
Amortized Cost 523,351 543,183
Fair Value 517,109 562,690
Gross Unrealized Gains 8,565 23,697
Gross Unrealized Losses (14,807) (4,190)
Municipal    
Available-for-sale    
Amortized Cost 589,073 464,769
Fair Value 610,400 481,425
Gross Unrealized Gains 21,375 16,789
Gross Unrealized Losses $ (48) (133)
General obligations to state and local governments Percentage 47.00%  
Revenue based obligations percentage 53.00%  
Percentage of securities of portfolio rated as AA or better 92.00%  
Percentage of securities of portfolio rated as A or better 99.00%  
Debt securities    
Available-for-sale    
Amortized Cost $ 1,518,156 1,448,204
Fair Value 1,538,110 1,495,087
Gross Unrealized Gains 37,750 53,004
Gross Unrealized Losses (17,796) (6,121)
Equity securities    
Available-for-sale    
Amortized Cost 202,437 193,535
Fair Value 375,424 410,642
Gross Unrealized Gains 174,443 218,105
Gross Unrealized Losses (1,456) $ (998)
(Increase) decrease in Gross Unrealized Losses $ (500)