Derivative financial instruments - Schedule of fair value of derivative instruments (Details) - Interest rate swaps - cash flow hedges - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Offsetting Liabilities [Line Items]
Current assets	$ 4,668	$ 1,211
Non-current assets	1,155	1,233
Current liabilities	(191)	(630)
Non-current liabilities	(598)
Net derivative assets (liabilities)	$ 5,034	$ 1,814