Fair value measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of June 30, 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	—	61,578	61,578
Corporate	—	319,745	319,745
Foreign	—	192,068	192,068
U.S. Treasury Bonds	—	6,432	6,432
Equity securities	37,526	—	37,526
	37,526	579,823	617,349

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