Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of March 31, 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	—	44,089	44,089
Corporate	—	289,159	289,159
Foreign	—	275,585	275,585
U.S. Treasury Bonds	—	6,612	6,612
Equity securities	67,354	—	67,354
	67,354	615,445	682,799

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