Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of March 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	—	50,348	50,348
Corporate	—	302,527	302,527
Foreign	—	224,681	224,681
U.S. Treasury Bonds	—	6,597	6,597
Equity securities	28,250	—	28,250
	28,250	584,153	612,403

As of December 31, 2019, 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	—	53,823	53,823
Corporate	—	309,142	309,142
Foreign	—	236,073	236,073
U.S. Treasury Bonds	—	6,683	6,683
Equity securities	39,318	—	39,318
	39,318	605,721	645,039