Intangible assets and goodwill - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Goodwill	$ 1,786,000	$ 1,614,000	$ 1,614,000
Accumulated impairment losses	(159,000)	(159,000)	(159,000)
Goodwill, net	1,627,000	1,455,000	1,455,000
Impairment losses	0	0
Acquisition of Vricon	172,000
Earth intelligence
Goodwill
Goodwill	1,769,000	1,597,000	1,597,000
Accumulated impairment losses	(142,000)	(142,000)	(142,000)
Goodwill, net	1,627,000	1,455,000	1,455,000
Acquisition of Vricon	172,000
Space Infrastructure
Goodwill
Goodwill	17,000	17,000	17,000
Accumulated impairment losses	$ (17,000)	$ (17,000)	$ (17,000)