Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 9,614	$ 134,464
Post-retirement benefits	1,798	(694)
Proportionate share of Telesat other comprehensive income (loss)	22,033	(18,280)
Other comprehensive income (loss), Net-of-tax Amount	23,831	(18,974)
Comprehensive income (loss)	$ 33,445	$ 115,490

Other Comprehensive Income Proportionate Share Equity Method Investee Net Of Tax Portion Attributable To Parent.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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