Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of March 31, 2019, financial instruments measured at fair value on a recurring basis are summarized below:

	Level 1	Level 2	Fair value measurements
	($000 omitted)
Investments in securities:
Debt securities:
Municipal		61,348	61,348
Corporate		325,918	325,918
Foreign		196,430	196,430
U.S. Treasury Bonds		6,419	6,419
Equity securities	37,533		37,533
	37,533	590,115	627,648

As of December 31, 2018, financial instruments measured at fair value on a recurring basis are summarized below:

	Level 1	Level 2	Fair value measurements
	($000 omitted)
Investments in securities:
Debt securities:
Municipal	—	61,934	61,934
Corporate	—	328,495	328,495
Foreign	—	198,938	198,938
U.S. Treasury Bonds	—	12,653	12,653
Equity securities	33,997	—	33,997
	33,997	602,020	636,017