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FAIR VALUE MEASUREMENTS (DETAILS 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Level 3 [Member]
ABS - CLO Debt [Member]
Jun. 30, 2014
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Jun. 30, 2014
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Jun. 30, 2014
Discounted cash flow [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Jun. 30, 2014
Broker-dealer quote [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Jun. 30, 2014
Net asset value [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Jun. 30, 2014
Simulation model [Member]
Level 3 [Member]
Weather Related Derivative [Member]
Jun. 30, 2014
Minimum [Member]
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Jun. 30, 2014
Minimum [Member]
Discounted cash flow [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Jun. 30, 2014
Minimum [Member]
Simulation model [Member]
Level 3 [Member]
Weather Related Derivative [Member]
Jun. 30, 2014
Maximum [Member]
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Jun. 30, 2014
Maximum [Member]
Discounted cash flow [Member]
Level 3 [Member]
Other Investments - CLO-Equities [Member]
Jun. 30, 2014
Maximum [Member]
Simulation model [Member]
Level 3 [Member]
Weather Related Derivative [Member]
Jun. 30, 2014
Weighted Average [Member]
Discounted cash flow [Member]
Level 3 [Member]
ABS - CLO Debt [Member]
Jun. 30, 2014
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 $ 12,598,897 $ 11,986,327 $ 30,883   $ 30,091   $ 792                    
Other investments 1,044,492 1,045,810   91,106   37,719   53,387                  
Net derivative assets                 $ (750)                
Credit spread                   3.00%     4.70%     3.50%  
Illiquidity discount         5.00%                     5.00%  
Default rates                     4.00%     5.00%     4.30%
Loss severity rate           53.50%                     53.50%
Collateral spreads                     2.60%     3.50%     3.30%
Estimated maturity dates (years)                     3 years 183 days     4 years 183 days     4 years 0 days
Weather curve                       21     106    
Weather standard deviation                       12     58