Investments in Affiliates (Equity in Net Income (Losses) of Affiliates) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ 76,515	$ 41,278	$ (40,559)	$ 83,282
Telesat Canada [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ 76,515	$ 41,278	$ (40,559)	$ 83,282