Revenue recognition - Contract Liabilities and Contract Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract assets, net - current	$ 8,567	$ 8,083
Contract assets, net - non-current	22,176	28,651
Total contract assets, net	30,743	36,734
Contract liabilities	69,254	12,748
Contract liabilities, net - non-current	41,818	0
Contract liabilities, net - current	111,072	12,748
Revenue recognized in the year from:
Amounts included in contract liabilities at the beginning of the year	$ 12,748	$ 2,951