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Investments (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Proceeds received from sales of fixed maturities and equity securities
Proceeds received, Fixed maturity securities		$ 576,708	$ 587,909	$ 673,882
Proceeds received, Equity securities		6,057	1,078	35,499
Gross gains realized		39,941	39,709	51,220
Gross losses realized	(15,152)	(12,643)	(1,974)	(20,655)
Fixed Maturity Securities [Member]
Proceeds received from sales of fixed maturities and equity securities
Gross gains realized		32,532	39,463	39,939
Gross losses realized		(11,971)	(2,047)	(18,495)
Equity Securities [Member]
Proceeds received from sales of fixed maturities and equity securities
Gross gains realized		231	247	1,520
Gross losses realized		$ (438)		$ (1,801)

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