Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of September 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	—	54,964	54,964
Corporate	—	311,148	311,148
Foreign	—	189,308	189,308
U.S. Treasury Bonds	—	6,566	6,566
Equity securities	37,207	—	37,207
	37,207	561,986	599,193

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