Investments in debt and equity securities (Tables)

3 Months Ended

Mar. 31, 2013

Amortized Costs and Fair Values

The amortized costs and fair values follow:

	March 31, 2013				December 31, 2012
	Amortized costs		Fair values		Amortized costs		Fair values
	($000 omitted)
Debt securities:
Municipal		38,312		38,625		18,012		19,011
Corporate and utilities		269,246		287,484		268,874		287,528
Foreign		165,860		168,166		168,084		169,009
U.S. Government		14,343		15,622		15,243		16,638
Equity securities		10,870		12,153		10,870		11,073
		498,631		522,050		481,083		503,259

Gross Unrealized Gains and Losses

Gross unrealized gains and losses were:

	March 31, 2013				December 31, 2012
	Gains		Losses		Gains		Losses
	($000 omitted)
Debt securities:
Municipal		627		314		1,006		7
Corporate and utilities		18,781		543		19,141		486
Foreign		2,374		68		1,210		286
U.S. Government		1,279		—		1,395		—
Equity securities		1,284		1		278		75
		24,345		926		23,030		854

Debt Securities According to Contractual Terms

Debt securities as of March 31, 2013 mature, according to their contractual terms, as follows (actual maturities may differ due to call or prepayment rights):

	Amortized costs		Fair values
	($000 omitted)
In one year or less		74,930		74,983
After one year through five years		163,686		170,006
After five years through ten years		217,605		231,292
After ten years		31,540		33,616
		487,761		509,897

Gross Unrealized Losses on Investments and Fair Values of Related Securities

As of March 31, 2013, gross unrealized losses on investments and the fair values of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were:

	Less than 12 months				More than 12 months				Total
	Losses		Fair values		Losses		Fair values		Losses		Fair values
	($000 omitted)
Debt securities:
Municipal		295		23,131		19		1,297		314		24,428
Corporate and utilities		543		34,715		—		—		543		34,715
Foreign		20		7,234		48		58,395		68		65,629
Equity securities		1		767		—		—		1		767
		859		65,847		67		59,692		926		125,539

As of December 31, 2012, gross unrealized losses on investments and the fair values of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were:

	Less than 12 months				More than 12 months				Total
	Losses		Fair values		Losses		Fair values		Losses		Fair values
	($000 omitted)
Debt securities:
Municipal		7		697		—		—		7		697
Corporate and utilities		486		30,538		—		—		486		30,538
Foreign		168		41,056		118		59,538		286		100,594
Equity securities:		75		2,197		—		—		75		2,197
		736		74,488		118		59,538		854		134,026