Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value on recurring basis

At December 31, 2023, 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	—	22,031	—	22,031
Corporate	—	231,474	—	231,474
Foreign	—	323,391	—	323,391
U.S. Treasury Bonds	—	33,340	—	33,340
Equity securities:	69,700	—	—	69,700
	69,700	610,236	—	679,936

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