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FAIR VALUE MEASUREMENTS (DETAILS 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Level 3 [Member]
ABS - CLO Debt [Member]
Dec. 31, 2013
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Dec. 31, 2013
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Dec. 31, 2013
Discounted cash flow [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Dec. 31, 2013
Broker-dealer quote [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Dec. 31, 2013
Net asset value [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Dec. 31, 2013
Simulation model [Member]
Level 3 [Member]
Weather Related Derivative [Member]
Dec. 31, 2013
Minimum [Member]
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Dec. 31, 2013
Minimum [Member]
Discounted cash flow [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Dec. 31, 2013
Minimum [Member]
Simulation model [Member]
Level 3 [Member]
Weather Related Derivative [Member]
Dec. 31, 2013
Maximum [Member]
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Dec. 31, 2013
Maximum [Member]
Discounted cash flow [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Dec. 31, 2013
Maximum [Member]
Simulation model [Member]
Level 3 [Member]
Weather Related Derivative [Member]
Dec. 31, 2013
Weighted Average [Member]
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Dec. 31, 2013
Weighted Average [Member]
Discounted cash flow [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]                                  
Fixed maturities $ 11,986,327 $ 11,928,049 $ 30,799   $ 29,944   $ 855                    
Other investments 1,045,810 843,437   73,866   39,706   34,160                  
Net derivative assets                 $ 169                
Credit spread                   3.30%     4.60%     3.70%  
Illiquidity discount         5.00%                     5.00%  
Default rates                     4.00%     5.00%     4.40%
Loss severity rate           53.50%                     53.50%
Collateral spreads                     2.60%     3.40%     3.30%
Estimated maturity dates (years)                     2 years 37 days     4 years 219 days     4 years 73 days
Weather curve                       525     4,750    
Weather standard deviation                       94     290