Investments (Details - Net Realized and Unrealized Investment Gains) (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 Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Net realized and unrealized investment gains (losses)	$ 5,100	$ 257,400	$ 38,100	$ 192,700	$ 74,600	$ 26,100	$ 78,200	$ (112,200)	$ 493,409	$ 66,692	$ 401,482
[TradingSecuritiesMember]
Schedule of Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Net realized and unrealized investment gains (losses)									493,409	66,692	401,482
[TradingSecuritiesMember] | [FixedMaturitiesAndShortTermInvestmentsMember]
Schedule of Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Change in net unrealized investment gains (losses)									186,063	128,224	142,634
Net realized gains (losses) on trading securities									172,987	157,207	173,426
[TradingSecuritiesMember] | [OtherInvestedAssetsMember]
Schedule of Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Change in net unrealized investment gains (losses)									(9,568)	(46,278)	3,742
Net realized gains (losses) on trading securities									(16,691)	(176,295)	(68,568)
[TradingSecuritiesMember] | [EquitySecuritiesMember]
Schedule of Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Change in net unrealized investment gains (losses)									66,253	(101,860)	64,825
Net realized gains (losses) on trading securities									72,155	90,866	44,736
[TradingSecuritiesMember] | [OtherInvestmentIncomeMember]
Schedule of Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Other net realized gains									5,843	3,617	13,335
[TradingSecuritiesMember] | [FundsHeldDirectlyManagedInvestmentMember]
Schedule of Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Net realized and unrealized investment gains (losses)									$ 16,367	$ 11,211	$ 27,352