Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

As of September 30, 2023, 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	—	23,278	23,278
Corporate	—	231,038	231,038
Foreign	—	299,748	299,748
U.S. Treasury Bonds	—	31,342	31,342
Equity securities	75,333	—	75,333
	75,333	585,406	660,739

As of December 31, 2022, 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	—	29,835	29,835
Corporate	—	254,316	254,316
Foreign	—	299,137	299,137
U.S. Treasury Bonds	—	28,646	28,646
Equity securities	98,149	—	98,149
	98,149	611,934	710,083