Contract balances (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Construction Contractor, Contract Cost, Subject to Uncertainty, Amount	$ 30,000		$ 30,000
Contract assets	199,370		199,370		$ 154,144
Change in contract assets			45,226
Contract liabilities - current	(183,705)		(183,705)		(168,361)
Change in contract liabilities - current			(15,344)
Contract liabilities - noncurrent	(435)		(435)		(6)
Change in contract liabilities - noncurrent			(429)
Net contract assets (liabilities)	15,230		15,230		$ (14,223)
Change in net contract assets (liabilities)			29,453
Amounts included in contract liability at the beginning of the period	6,300	$ 8,200	164,300	$ 118,700
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 20,200	$ 9,600	$ 41,700	$ 43,700