Investment Income (Tables)

6 Months Ended

Jun. 30, 2012

Investment Income [Abstract]

Gross realized investment and other gains and losses

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2012			2011			2012			2011
	($000 omitted)
Realized gains		1,878			2,741			3,349			3,591
Realized losses		(789	)		(3,974	)		(816	)		(4,692	)
		1,089			(1,233	)		2,533			(1,101	)

Proceeds from the sales of investments available-for-sale

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2012		2011		2012		2011
	($000 omitted)
Proceeds from sales of investments available-for-sale		35,314		94,971		68,678		110,759