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Fair Value (Details - Valuation Technique and Inputs) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value Inputs Assets Quantitative Information [Line Items]    
Fixed maturities, trading securities $ 13,379,611 $ 14,395,315
Equities, trading securities 1,172,855 1,094,002
Other invested assets carried at fair value 144,877 71,204
Funds held directly managed investments carried at fair value 670,199 833,247
[FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Fixed maturities, trading securities 745,347 657,273
Equities, trading securities 30,601 27,728
Other invested assets carried at fair value 98,212 87,099
Funds held directly managed investments carried at fair value 15,544 18,321
[USStatesAndPoliticalSubdivisionsMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Fixed maturities, trading securities 219,163 233,235
[USStatesAndPoliticalSubdivisionsMember] | [MinimumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 3.10% 2.80%
[USStatesAndPoliticalSubdivisionsMember] | [MaximumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 4.60% 4.50%
[USStatesAndPoliticalSubdivisionsMember] | [WeightedAverageMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 3.90% 3.70%
[InterestOnlyStripMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Fixed maturities, trading securities 11,489 12,625
[InterestOnlyStripMember] | [MinimumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Prepayment speed 20.00% 20.00%
Credit spreads 7.00% 6.80%
[InterestOnlyStripMember] | [MaximumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Prepayment speed 20.00% 20.00%
Credit spreads 12.10% 11.70%
[InterestOnlyStripMember] | [WeightedAverageMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Prepayment speed 20.00% 20.00%
Credit spreads 9.50% 9.10%
[AssetBackedSecuritiesSecuritizedLoansAndReceivablesExcludingInterestOnlyStripMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Fixed maturities, trading securities 414,799 310,509
[AssetBackedSecuritiesSecuritizedLoansAndReceivablesExcludingInterestOnlyStripMember] | [MinimumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 4.00% 4.00%
[AssetBackedSecuritiesSecuritizedLoansAndReceivablesExcludingInterestOnlyStripMember] | [MaximumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 12.30% 12.20%
[AssetBackedSecuritiesSecuritizedLoansAndReceivablesExcludingInterestOnlyStripMember] | [WeightedAverageMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 7.50% 7.60%
[FinanceMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Equities, trading securities 13,000 13,477
[FinanceMember] | [MinimumMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 3.60% 0.80%
Net Income Multiple 14.600  
Tangible book value 1.100  
Liquidity discount 25.00%  
[FinanceMember] | [MaximumMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 3.60% 0.80%
Net Income Multiple 14.600  
Tangible book value 1.100  
Liquidity discount 25.00%  
[FinanceMember] | [WeightedAverageMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 3.60% 0.80%
Net Income Multiple 14.600  
Tangible book value 1.100  
Liquidity discount 25.00%  
[TechnologyMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Equities, trading securities 8,012 6,987
[TechnologyMember] | [MinimumMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 4.80% (1.50%)
Revenue multiple 2.000  
Liquidity discount 25.00%  
Adjusted earnings multiple 12.900  
[TechnologyMember] | [MaximumMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 4.80% (1.50%)
Revenue multiple 2.000  
Liquidity discount 25.00%  
Adjusted earnings multiple 12.900  
[TechnologyMember] | [WeightedAverageMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 4.80% (1.50%)
Revenue multiple 2.000  
Liquidity discount 25.00%  
Adjusted earnings multiple 12.900  
[CommunicationsMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Equities, trading securities 2,040  
[CommunicationsMember] | [MinimumMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 0.00%  
Adjusted earnings multiple 10.000  
[CommunicationsMember] | [MaximumMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 0.00%  
Adjusted earnings multiple 10.000  
[CommunicationsMember] | [WeightedAverageMember] | [WeightedMarketComparablesMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Comparable return 0.00%  
Adjusted earnings multiple 10.000  
[TotalReturnSwapMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other invested assets carried at fair value 2,425 6,084
[TotalReturnSwapMember] | [MinimumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 3.10% 2.60%
[TotalReturnSwapMember] | [MaximumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 4.60% 4.60%
[TotalReturnSwapMember] | [WeightedAverageMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 3.60% 3.20%
[OtherInvestedAssetsNotesAndLoanReceivablesMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other invested assets carried at fair value 24,265 24,902
[OtherInvestedAssetsNotesAndLoanReceivablesMember] | [MinimumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 17.50% 17.50%
Revenue multiple 1.600 1.700
[OtherInvestedAssetsNotesAndLoanReceivablesMember] | [MaximumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 17.50% 17.50%
Revenue multiple 1.700 2.100
[OtherInvestedAssetsNotesAndLoanReceivablesMember] | [WeightedAverageMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 17.50% 17.50%
Revenue multiple 1.600 1.800
[OtherInvestedAssetsNotesSecuritizationMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other invested assets carried at fair value 19,959 10,000
[OtherInvestedAssetsNotesSecuritizationMember] | [MinimumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 6.70% 6.50%
[OtherInvestedAssetsNotesSecuritizationMember] | [MaximumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 6.70% 6.50%
[OtherInvestedAssetsNotesSecuritizationMember] | [WeightedAverageMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Credit spreads 6.70% 6.50%
[OtherInvestedAssetsAnnuitiesAndResidualsMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other invested assets carried at fair value 30,555 46,882
[OtherInvestedAssetsAnnuitiesAndResidualsMember] | [MinimumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Prepayment speed 0.00% 0.00%
Credit spreads 6.20% 4.70%
Constant default rate 0.30% 2.30%
[OtherInvestedAssetsAnnuitiesAndResidualsMember] | [MaximumMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Prepayment speed 15.00% 15.00%
Credit spreads 8.70% 9.90%
Constant default rate 35.00% 35.00%
[OtherInvestedAssetsAnnuitiesAndResidualsMember] | [WeightedAverageMember] | [DiscountedCashFlowMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Prepayment speed 7.40% 7.60%
Credit spreads 7.20% 7.20%
Constant default rate 13.50% 13.20%
[PrivateEquityDirectMember] | [LiquidationAnalysisMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other invested assets carried at fair value 15,635  
[PrivateEquityDirectMember] | [MinimumMember] | [LiquidationAnalysisMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00%  
Value of intangible assets 0  
[PrivateEquityDirectMember] | [MaximumMember] | [LiquidationAnalysisMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00%  
Value of intangible assets 0  
[PrivateEquityDirectMember] | [WeightedAverageMember] | [LiquidationAnalysisMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00%  
Value of intangible assets 0  
[PrivateEquityFundsMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other invested assets carried at fair value 5,465 1,404
[PrivateEquityFundsMember] | [MinimumMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00% 100.00%
Market adjustments (13.00%) 7.30%
[PrivateEquityFundsMember] | [MaximumMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00% 100.00%
Market adjustments 0.00% 7.30%
[PrivateEquityFundsMember] | [WeightedAverageMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00% 100.00%
Market adjustments (4.00%) 7.30%
[OtherInvestedAssetsFundsHeldDirectlyManagedLagReportedNetAssetValuesMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Funds held directly managed investments carried at fair value $ 15,207 $ 17,976
[OtherInvestedAssetsFundsHeldDirectlyManagedLagReportedNetAssetValuesMember] | [MinimumMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00% 100.00%
Market adjustments (20.10%) (38.10%)
[OtherInvestedAssetsFundsHeldDirectlyManagedLagReportedNetAssetValuesMember] | [MaximumMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00% 100.00%
Market adjustments 0.00% 0.00%
[OtherInvestedAssetsFundsHeldDirectlyManagedLagReportedNetAssetValuesMember] | [WeightedAverageMember] | [LagReportedNetAssetValueMember] | [FairValueInputsLevel3Member]
   
Fair Value Inputs Assets Quantitative Information [Line Items]    
Net asset value, lag reported 100.00% 100.00%
Market adjustments (15.10%) (12.10%)