Investment Income (Tables)

9 Months Ended

Sep. 30, 2012

Investment Income [Abstract]

Gross realized investment and other gains and losses

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2012			2011			2012			2011
	($000 omitted)
Realized gains		3,658			884			7,008			4,476
Realized losses		(426	)		(1,897	)		(1,242	)		(6,591	)
		3,232			(1,013	)		5,766			(2,115	)

Proceeds from the sales of investments available-for-sale

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2012		2011		2012		2011
	($000 omitted)
Proceeds from sales of investments available-for-sale		22,027		15,406		90,705		126,165