Investments in Affiliates (Equity in Net Income (Losses) of Affiliates) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ 49,645	$ 8,784	$ 9,086	$ 92,066
Telesat Holdings Inc [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) income of affiliates	$ 49,645	$ 8,784	$ 9,086	$ 92,066