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Investments (Details) - Analysis of net realized gains (losses) and the change in unrealized (losses) gains on investments (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net realized gains (losses):
Gross realized gains	$ 33,136	$ 55,625	$ 153,757	$ 143,804
Gross realized losses on investments sold	(26,000)	(51,164)	(89,053)	(150,703)
OTTI on investments, net of amounts transferred to other comprehensive income	(12,629)	(66,815)	(61,787)	(131,436)
Total net realized gains (losses) on investments	$ (5,493)	$ (62,354)	$ 2,917	$ (138,335)

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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