Investments in Affiliates (Equity in Net Income (Losses) of Affiliates) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Equity in net income (loss) of affiliates	$ 8,784	$ 55,095	$ 92,066	$ 56,734
Telesat Canada [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net income (loss) of affiliates	$ 8,784	$ 55,095	$ 92,066	$ 56,734