Investments in debt and equity securities (Tables)

12 Months Ended

Dec. 31, 2013

Amortized Costs and Fair Values

The amortized costs and fair values at December 31 follow:

	2013				2012
	Amortized costs		Fair values		Amortized costs		Fair values
	($000 omitted)
Debt securities:
Municipal		47,808		47,252		18,012		19,011
Corporate		285,104		291,832		268,874		287,528
Foreign		164,146		162,367		168,084		169,009
U.S. Government		14,334		15,197		15,243		16,638
Equity securities		17,441		20,695		10,870		11,073
		528,833		537,343		481,083		503,259

Gross Unrealized Gains and Losses

Gross unrealized gains and losses at December 31 were:

	2013				2012
	Gains		Losses		Gains		Losses
	($000 omitted)
Debt securities:
Municipal		258		813		1,006		7
Corporate		9,955		3,228		19,141		486
Foreign		363		2,142		1,210		286
U.S. Government		924		60		1,395		—
Equity securities		3,264		11		278		75
		14,764		6,254		23,030		854

Debt Securities According to Contractual Terms

Debt securities at December 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		45,430		45,467
After one year through five years		250,193		255,257
After five years through ten years		193,574		193,825
After ten years		22,194		22,099
		511,391		516,648

Gross Unrealized Losses on Investments and Fair Values of Related Securities

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 at December 31, 2013, were:

	Less than 12 months				More than 12 months				Total
	Losses		Fair values		Losses		Fair values		Losses		Fair values
	($000 omitted)
Debt securities:
Municipal		770		27,686		43		628		813		28,314
Corporate		1,682		66,776		1,546		21,710		3,228		88,486
Foreign		1,539		63,039		603		53,807		2,142		116,846
U.S. Government		60		3,772		—		—		60		3,772
Equity securities:		11		1,267		—		—		11		1,267
		4,062		162,540		2,192		76,145		6,254		238,685

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 at December 31, 2012, 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		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