Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2014

Financial Instruments Measured at Fair Value on Recurring Basis

As of March 31, 2014, financial instruments measured at fair value on a recurring basis are summarized below:

	Level 1		Level 2		Fair value measurements
	($000 omitted)
Investments available-for-sale:
Debt securities:
Municipal		—		58,111		58,111
Corporate		—		302,852		302,852
Foreign		—		161,192		161,192
U.S. Government		—		15,112		15,112
Equity securities		21,300		—		21,300
		21,300		537,267		558,567

As of December 31, 2013, financial instruments measured at fair value on a recurring basis are summarized below:

	Level 1		Level 2		Fair value measurements
	($000 omitted)
Investments available-for-sale:
Debt securities:
Municipal		—		47,252		47,252
Corporate		—		291,832		291,832
Foreign		—		162,367		162,367
U.S. Government		—		15,197		15,197
Equity securities		20,695		—		20,695
		20,695		516,648		537,343