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Investments (Details 10) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Investment Gains And Losses [Abstract]
Other-than-temporary impairments on fixed maturity securities	$ 202,000	$ 7,607,000
Portion of loss recognized in accumulated other comprehensive income (before taxes)	0	(7,221,000)
Net other-than-temporary impairment losses on fixed maturities recognized in earnings	202,000	14,828,000
Impairment Losses On Equity Securities	0	(839,000)
Gain on investment activity	21,680,000	22,312,000
Loss on investment activity	(11,212,000)	(7,504,000)
Other impairment losses	(1,626,000)	(5,843,000)
Derivatives And Other Investments Net	85,731,000	50,222,000
Net gains (losses)	$ 94,371,000	$ 43,520,000

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Net realized gains or losses on investments during the period related to the change in value of embedded derivatives and other realized gains and losses not otherwise categorized.

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Other impairment losses and change in mortgage loan provision.

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Other Than Temporary Impairments On Fixed Maturity Securities Transferred To Other Comprehensive Loss

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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