Regulatory Authorizations - Intangibles Rollforward (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Cost
Weighted average useful life (in years)	13 years
Accumulated Amortization
Amortization expense	$ (3,181)	$ (2,635)
Finite-Lived Intangible Assets, Total
Balance at the beginning of the period	20,550		$ 29,507
Balance at the end of the period	20,550
Indefinite lived
Balance at the beginning of the period	440,291	400,042
Disposals		(43)
Foreign currency translation	729	0
Balance at the end of the period	441,020	399,999
Other Intangible Assets, Total
Balance at the beginning of the period	478,598	430,039
Foreign currency translation	407	(1,172)
Balance at the end of the period	475,824	426,189
Regulatory authorization
Cost
Balance at the beginning of the period	58,451	46,787
Foreign currency translation	607	(1,986)
Balance at the end of the period	59,058	44,801
Accumulated Amortization
Balance at the beginning of the period	(20,144)	(16,790)
Amortization expense	(3,181)	(2,635)
Foreign currency translation	(929)	814
Balance at the end of the period	(24,254)	(18,611)
Finite-Lived Intangible Assets, Total
Balance at the beginning of the period	34,804	26,190	$ 38,307	$ 29,997
Foreign currency translation	(322)	(1,172)
Balance at the end of the period	$ 34,804	$ 26,190