Derivatives (Details - Income Statement) ([NondesignatedMember], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	$ 13,735	$ (76,700)	$ 21,297	$ (112,910)
[ForeignCurrencyGainLossMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	23,037	8,081	44,245	58,696
[NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(9,302)	(84,781)	(22,948)	(171,606)
[ForeignExchangeForwardMember] | [ForeignCurrencyGainLossMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	21,976	21,221	41,686	69,455
[ForeignExchangeOptionMember] | [ForeignCurrencyGainLossMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	1,061	(13,140)	2,559	(10,759)
[FutureMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(14,979)	(82,227)	(34,758)	(168,741)
[CreditDefaultSwapBuyingProtectionMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(250)	736	(861)	185
[CreditDefaultSwapSellingProtectionMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	398	(1,670)	1,709	(63)
[InsuranceLinkedSecuritiesMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	3,934	(3,970)	5,160	(13,590)
[TotalReturnSwapMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(773)	308	(1,242)	992
[InterestRateSwapMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(200)	(2,913)	(402)	(2,272)
[ToBeAnnouncedSecuritiesMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	$ 2,568	$ 4,955	$ 7,446	$ 11,883