Earnings Per Share (Schedule of Dilutive Impact of Equity Method Investee Stock Options) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) - basic	$ 38,516	$ 4,294
Less: Adjustment for dilutive effect of Telesat stock options	(254)	(29)
Net income (loss) - diluted	$ 38,262	$ 4,265