Investments (Details - Investment Income) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net	$ 135,700	$ 135,300	$ 153,500	$ 146,900	$ 155,500	$ 163,700	$ 158,300	$ 151,600	$ 571,338	$ 629,148	$ 672,782
[TradingSecuritiesMember]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net									571,338	629,148	672,782
[TradingSecuritiesMember] | [FixedMaturitiesMember]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net									512,833	561,576	580,258
[TradingSecuritiesMember] | [ShortTermInvestmentsCashAndCashEquivalentsMember]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net									2,905	3,843	8,541
[TradingSecuritiesMember] | [EquitySecuritiesMember]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net									26,207	19,815	20,794
[TradingSecuritiesMember] | [FundsHeldAndOtherMember]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net									44,109	49,502	52,794
[TradingSecuritiesMember] | [FundsHeldDirectlyManagedInvestmentMember]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net									29,031	37,919	51,775
[TradingSecuritiesMember] | [InvestmentExpensesMember]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income Net									$ (43,747)	$ (43,507)	$ (41,380)