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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Oct. 31, 2012
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Notional amount and fair value of the entity's derivative financial instruments            
Number of portfolio maintenance agreements           2
Realized investment gains (losses) - derivatives, gross $ 32,212 $ (116,663) $ 102,410 $ (194,340)    
Notional Amount, Other long-term investments 5,699,323   5,699,323   7,567,811  
Fair Value, Other long-term investments 196,172   196,172   130,428  
Notional Amount, Other liabilities 6,221,182   6,221,182   9,672,554  
Fair Value, Other liabilities 427,470   427,470   657,874  
PLC
            
Notional amount and fair value of the entity's derivative financial instruments            
Number of portfolio maintenance agreements 2   2      
Derivatives not designated as hedging instruments
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross 3,292 (32,534) (77,481) (69,106)    
Realized investment gains (losses) - derivatives, gross 32,212 (116,663) 102,410 (194,340)    
Derivatives not designated as hedging instruments | PLC
            
Notional amount and fair value of the entity's derivative financial instruments            
Notional Amount, Other long-term investments 1,508,964   1,508,964   1,404,750  
Fair Value, Other long-term investments 2,376   2,376   17,064  
Derivatives not designated as hedging instruments | Interest rate futures
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross (2,255) (3,371) (26,393) 32,419    
Notional Amount, Other long-term investments 111,534   111,534      
Fair Value, Other long-term investments 1,106   1,106      
Notional Amount, Other liabilities 175,681   175,681   893,476  
Fair Value, Other liabilities 531   531   13,970  
Derivatives not designated as hedging instruments | Equity futures
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross (12,568) (17,324) (39,829) (42,643)    
Notional Amount, Other long-term investments 47,994   47,994   147,581  
Fair Value, Other long-term investments 937   937   595  
Notional Amount, Other liabilities 94,457   94,457   152,364  
Fair Value, Other liabilities 1,484   1,484   3,316  
Derivatives not designated as hedging instruments | Currency future
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross (6,531) (3,078) 1,440 (2,298)    
Notional Amount, Other long-term investments         15,944  
Fair Value, Other long-term investments         784  
Notional Amount, Other liabilities 126,389   126,389   131,979  
Fair Value, Other liabilities 3,350   3,350   1,901  
Derivatives not designated as hedging instruments | Volatility futures
            
Notional amount and fair value of the entity's derivative financial instruments            
Positions held 0   0      
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross       (132)    
Derivatives not designated as hedging instruments | Variance swaps
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross (1,347) (5,840) (9,566) (6,660)    
Notional Amount, Other long-term investments         500  
Fair Value, Other long-term investments         406  
Notional Amount, Other liabilities         2,675  
Fair Value, Other liabilities         12,198  
Derivatives not designated as hedging instruments | Equity options
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross (29,094) (9,184) (65,631) (29,903)    
Notional Amount, Other long-term investments 1,467,720   1,467,720   573,493  
Fair Value, Other long-term investments 80,754   80,754   61,833  
Notional Amount, Other liabilities 144,408   144,408      
Fair Value, Other liabilities 5,939   5,939      
Derivatives not designated as hedging instruments | Interest rate swaptions
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross 1,725 (3,019) (738) 2,293    
Notional Amount, Other long-term investments 625,000   625,000   400,000  
Fair Value, Other long-term investments 27,978   27,978   11,370  
Derivatives not designated as hedging instruments | Interest rate swaps
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross (19,224) 6,361 (125,502) 10,187    
Realized investment gains (losses) - derivatives, gross 72 199 2,984 (680)    
Notional Amount, Other long-term investments 200,000   200,000   355,000  
Fair Value, Other long-term investments 2,035   2,035   6,532  
Notional Amount, Other liabilities 1,500,000   1,500,000   400,000  
Fair Value, Other liabilities 132,592   132,592   10,025  
Derivatives not designated as hedging instruments | Embedded derivative - GMWB
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross 40,379 2,921 146,693 (32,369)    
Notional Amount, Other long-term investments 1,692,535   1,692,535   1,640,075  
Fair Value, Other long-term investments 79,827   79,827   30,261  
Notional Amount, Other liabilities 114,940   114,940   5,253,961  
Fair Value, Other liabilities 1,992   1,992   199,530  
Derivatives not designated as hedging instruments | Funds withheld derivative
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives related to variable and FIA annuity contracts, gross 32,207   42,045      
Notional Amount, Other liabilities 1,178,524   1,178,524      
Fair Value, Other liabilities 49,045   49,045      
Derivatives not designated as hedging instruments | Embedded derivative - Modco reinsurance treaties
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives, gross 30,074 (101,999) 191,847 (139,972)    
Notional Amount, Other long-term investments 45,314   45,314   30,244  
Fair Value, Other long-term investments 802   802   1,330  
Notional Amount, Other liabilities 2,598,832   2,598,832   2,655,134  
Fair Value, Other liabilities 219,532   219,532   411,907  
Derivatives not designated as hedging instruments | Embedded derivative - FIA
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives, gross (104)   (145)      
Notional Amount, Other liabilities 104,951   104,951      
Fair Value, Other liabilities 9,199   9,199      
Derivatives not designated as hedging instruments | Interest rate caps
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives, gross   (143)   (2,658)    
Notional Amount, Other long-term investments         3,000,000  
Derivatives not designated as hedging instruments | Derivatives with PLC
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives, gross (1,159) 17,559 (14,689) 18,059    
Derivatives not designated as hedging instruments | Other
            
Notional amount and fair value of the entity's derivative financial instruments            
Realized investment gains (losses) - derivatives, gross 37 255 (106) 17    
Notional Amount, Other long-term investments 262   262   224  
Fair Value, Other long-term investments 357   357   253  
Derivatives not designated as hedging instruments | Other- FIA volatility futures
            
Notional amount and fair value of the entity's derivative financial instruments            
Notional Amount, Other liabilities 35   35      
Cash flow hedges | Inflation
            
Notional amount and fair value of the entity's derivative financial instruments            
Notional Amount, Other liabilities 182,965   182,965   182,965  
Fair Value, Other liabilities $ 3,806   $ 3,806   $ 5,027