Fair value measurements (Tables)

6 Months Ended

Jun. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of financial instruments measured at fair value on recurring basis

As of June 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	—	25,949	25,949
Corporate	—	233,200	233,200
Foreign	—	311,354	311,354
U.S. Treasury Bonds	—	31,424	31,424
Equity securities	78,226	—	78,226
	78,226	601,927	680,153

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