Investments in Affiliates (Equity in Net Income (Losses) of Affiliates) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in net income (loss) of affiliates	$ 116,716	$ 101,403
Telesat Holdings Inc [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net income (loss) of affiliates	$ 116,716	$ 101,403