Derivatives (Details - Income Statement) ([NondesignatedMember], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	$ (20,621)	$ 4,722	$ 7,562	$ (36,210)
[ForeignCurrencyGainLossMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	14,000	67,707	21,208	50,615
[NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(34,621)	(62,985)	(13,646)	(86,825)
[ForeignExchangeForwardMember] | [ForeignCurrencyGainLossMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	15,829	65,250	19,710	48,234
[ForeignExchangeOptionMember] | [ForeignCurrencyGainLossMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(1,829)	2,457	1,498	2,381
[FutureMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(41,624)	(66,231)	(19,779)	(86,514)
[CreditDefaultSwapBuyingProtectionMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(14)	(306)	(611)	(551)
[CreditDefaultSwapSellingProtectionMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	235	770	1,311	1,607
[InsuranceLinkedSecuritiesMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	4,685	(2,546)	1,226	(9,620)
[TotalReturnSwapMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(546)	(115)	(469)	684
[InterestRateSwapMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	(1,165)	(182)	(202)	641
[ToBeAnnouncedSecuritiesMember] | [NetRealizedAndUnrealizedInvestmentGainsAndLossesMember]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain(loss) on derivatives recognized in income	$ 3,808	$ 5,625	$ 4,878	$ 6,928