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Investments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Proceeds received from sales of fixed maturities and equity securities
Proceeds received, Fixed maturity securities	$ 191,155	$ 246,127	$ 470,684	$ 457,411
Proceeds received, Equity securities	1,970		2,894
Fixed Maturity Securities [Member]
Proceeds received from sales of fixed maturities and equity securities
Gross gains realized	10,528	19,272	27,891	28,954
Gross losses realized	(139)	(9)	(11,968)	(92)
Equity Securities [Member]
Proceeds received from sales of fixed maturities and equity securities
Gross gains realized	67		84
Gross losses realized	$ (157)		$ (233)

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