Investments in Affiliates (Equity in Net Income (Losses) of Affiliates) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ (117,074)	$ 42,004
Telesat Canada [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ (117,074)	$ 42,004