Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of March 31, 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	—	26,487	26,487
Corporate	—	244,479	244,479
Foreign	—	306,885	306,885
U.S. Treasury Bonds	—	30,463	30,463
Equity securities	81,441	—	81,441
	81,441	608,314	689,755

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