Investments in Affiliates (Equity in Net Income (Losses) of Affiliates) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ (14,924)	$ 49,645	$ 44,969	$ 9,086
Telesat Canada [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ (14,924)	$ 49,645	$ 44,969	$ 9,086