Leases - Future minimum payments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Operating lease liabilities
Operating leases - 2024	$ 23,167
Operating leases - 2025	28,327
Operating leases - 2026	19,932
Operating leases - 2027	14,531
Operating leases - 2028	12,074
Operating leases - later years	40,740
Operating leases - Total	138,771
Less: Imputed interest	(17,438)
Operating lease liabilities	121,333	$ 126,946
Finance lease liabilities
Finance leases - 2024	3,380
Finance leases - 2025	4,605
Finance leases - 2026	4,374
Finance leases - 2027	3,017
Finance leases - 2028	2,344
Finance leases - later years	10,434
Finance leases - Total	28,154
Less: imputed interest	(3,257)
Finance lease liabilities	$ 24,897	$ 25,778