Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Voting Common Stock [Member] Common Stock [Member]	Non-Voting Common Stock [Member] Common Stock [Member]	Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2017	$ 216	$ 95	$ 1,019,988	$ (9,592)	$ (682,831)	$ (37,278)	$ 290,598
Balance, shares at Dec. 31, 2017	21,582	9,506		154
Net income (loss)					9,614		9,614
Other comprehensive income (loss)						23,831	23,831
Comprehensive income (loss)							33,445
Tax Cuts and Jobs Act, reclassification tax effect					4,173	(4,173)
Cumulative effect adjustment attributable to investment in Telesat					(26,477)		(26,477)
Balance at Dec. 31, 2018	$ 216	$ 95	1,019,988	$ (9,592)	(695,521)	(17,620)	297,566
Balance, shares at Dec. 31, 2018	21,582	9,506		154
Net income (loss)					89,755		89,755
Other comprehensive income (loss)						(37,294)	(37,294)
Comprehensive income (loss)							52,461
Balance at Dec. 31, 2019	$ 216	$ 95	$ 1,019,988	$ (9,592)	$ (605,766)	$ (54,914)	$ 350,027
Balance, shares at Dec. 31, 2019	21,582	9,506		154