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Fair Value Valuation Technique and Inputs (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
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Dec. 31, 2011
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Fair Value Inputs Assets Quantitative Information [Line Items]                                                                                
Fair value inputs discount rate                   9.00% 14.50% 12.60%                                                        
Fair value inputs prepayment rate                           20.00% 33.30% 24.20%                                   0.00% 5.00% 3.00%        
Fair value inputs comparability adjustments                                           32.00% 32.00% 32.00%                                
Fair value inputs entity credit risk           3.10% 4.60% 3.60%           7.20% 12.10% 9.10%   3.90% 12.50% 6.60%           0.40% 4.60% 2.40%   13.50% 19.50% 16.50%   5.10% 18.20% 10.80%        
Fair value inputs revenue multiple                                                           1.4 2.8 2.1                
Fair value inputs probability of default                                                                   2.30% 40.00% 18.30%        
Fair value inputs lag reported net asset value                                                                           100.00% 100.00% 100.00%
Fair value inputs adjusted lag reported net asset value                                                                           (64.10%) 0.00% (14.40%)
Fixed maturities, trading securities $ 14,411,664 $ 13,941,829 $ 491,987 $ 480,530 $ 115,580       $ 9,877       $ 11,919       $ 252,537                                              
Equities, trading securities 943,458 944,691 19,379 16,165                                 12,730                                      
Other Invested Assets Carried At Fair Value 103,316 90,512 89,120 97,027                                         6,113       58,126       28,409              
Funds Held Directly Managed Investments Carried At Fair Value $ 1,144,697 $ 1,057,553 $ 18,012 $ 15,767                                                                 $ 17,683