Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

At December 31, 2022, financial instruments measured at fair value on a recurring basis are summarized below:

	Level 1	Level 2	Level 3	Fair value measurements
	(in $ thousands)
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

At December 31, 2021, financial instruments measured at fair value on a recurring basis are summarized below:

	Level 1	Level 2	Level 3	Fair value measurements
	(in $ thousands)
Investments in securities:
Debt securities:
Municipal	—	36,323	—	36,323
Corporate	—	258,102	—	258,102
Foreign	—	288,883	—	288,883
U.S. Treasury Bonds	—	6,464	—	6,464
Equity securities:	89,442	—	—	89,442
	89,442	589,772	—	679,214