Fair value measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of June 30, 2021, 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	—	42,462	42,462
Corporate	—	305,229	305,229
Foreign	—	280,861	280,861
U.S. Treasury Bonds	—	6,610	6,610
Equity securities	76,236	—	76,236
	76,236	635,162	711,398

As of December 31, 2020, 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	—	47,603	47,603
Corporate	—	305,450	305,450
Foreign	—	271,711	271,711
U.S. Treasury Bonds	—	6,622	6,622
Equity securities	53,001	—	53,001
	53,001	631,386	684,387