Goodwill, Regulatory Authorizations and Other Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Other intangible assets
Cost	$ 361,283	$ 361,300
Accumulated Amortization	(317,052)	(302,345)
Carrying Amount	44,231	58,955
Customer relationships
Other intangible assets
Cost	270,300	270,300
Accumulated Amortization	(244,787)	(231,642)
Carrying Amount	$ 25,513	38,658
Customer relationships | Weighted-average
Other intangible assets
Weighted Average Useful Life (in Years)	8 years
Technology-based
Other intangible assets
Cost	$ 61,283	61,300
Accumulated Amortization	(61,004)	(60,927)
Carrying Amount	$ 279	373
Technology-based | Weighted-average
Other intangible assets
Weighted Average Useful Life (in Years)	6 years
Trademark portfolio
Other intangible assets
Cost	$ 29,700	29,700
Accumulated Amortization	(11,261)	(9,776)
Carrying Amount	$ 18,439	$ 19,924
Trademark portfolio | Weighted-average
Other intangible assets
Weighted Average Useful Life (in Years)	20 years