Contract balances (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract assets	$ 164,622		$ 125,742
Change in contract assets	38,880
Contract liabilities - current	(154,136)		(179,140)
Change in contract liabilities - current	25,004
Contract liabilities - noncurrent	(40)		(118)
Change in contract liabilities - noncurrent	78
Net contract assets (liabilities)	10,446		$ (53,516)
Change in net contract assets (liabilities)	63,962
Amounts included in contract liability at the beginning of the period	121,800	$ 123,400
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 23,500	$ 34,300