Contract balances (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract assets	$ 236,951		$ 236,951		$ 125,742
Change in contract assets			111,209
Contract liabilities - current	(167,507)		(167,507)		(179,140)
Change in contract liabilities - current			11,633
Contract liabilities - noncurrent	(19)		(19)		(118)
Change in contract liabilities - noncurrent			99
Net contract assets (liabilities)	69,425		69,425		$ (53,516)
Change in net contract assets (liabilities)			122,941
Amounts included in contract liability at the beginning of the period	14,800	$ 21,900	136,700	$ 145,300
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 30,000	$ 27,300	$ 42,400	$ 54,600