Investments in debt and equity securities (Tables)

6 Months Ended

Jun. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Amortized Costs and Fair Values

The amortized costs and fair values follow:

	June 30, 2014		December 31, 2013
	Amortized costs	Fair values	Amortized costs	Fair values
	($000 omitted)
Debt securities:
Municipal	51,429	52,137	47,808	47,252
Corporate	291,951	305,035	285,104	291,832
Foreign	173,468	174,350	164,146	162,367
U.S. Treasury Bonds	14,330	15,042	14,334	15,197
Equity securities	17,549	22,479	17,441	20,695
	548,727	569,043	528,833	537,343

Gross Unrealized Gains and Losses

Gross unrealized gains and losses were:

	June 30, 2014		December 31, 2013
	Gains	Losses	Gains	Losses
	($000 omitted)
Debt securities:
Municipal	928	220	258	813
Corporate	13,939	855	9,955	3,228
Foreign	1,569	687	363	2,142
U.S. Treasury Bonds	743	31	924	60
Equity securities	5,158	228	3,264	11
	22,337	2,021	14,764	6,254

Debt Securities According to Contractual Terms

Debt securities as of June 30, 2014 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	2,674	2,711
After one year through five years	290,264	296,991
After five years through ten years	206,336	213,300
After ten years	31,904	33,562
	531,178	546,564

Gross Unrealized Losses on Investments and Fair Values of Related Securities

As of June 30, 2014, 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	2	719	218	18,888	220	19,607
Corporate	29	998	826	33,157	855	34,155
Foreign	571	58,245	116	6,673	687	64,918
U.S. Treasury Bonds	—	125	31	3,562	31	3,687
Equity securities	228	880	—	—	228	880
	830	60,967	1,191	62,280	2,021	123,247

As of December 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	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