Fair value measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

As of June 30, 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	—	50,068	50,068
Corporate	—	319,972	319,972
Foreign	—	236,224	236,224
U.S. Treasury Bonds	—	6,627	6,627
Equity securities	32,456	—	32,456
	32,456	612,891	645,347

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