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Investments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Proceeds received from sales of fixed maturities and equity securities
Proceeds received, Fixed maturity securities	$ 99,182	$ 158,292
Proceeds received, Equity securities	4,834	9
Fixed Maturity Securities [Member]
Proceeds received from sales of fixed maturities and equity securities
Gross gains realized	4,512	8,892
Gross losses realized	(10)	(9,145)
Equity Securities [Member]
Proceeds received from sales of fixed maturities and equity securities
Gross gains realized	568	9
Gross losses realized	$ (215)

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