Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income and Related Tax Effects) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Loss [Abstract]
Amortization of prior service credits and net actuarial loss, Before-Tax Amount	[1]	$ 203	$ 372
Proportionate share of Telesat Holdco other comprehensive income (loss), Before-Tax Amount	[2]	14,448
Other comprehensive income (loss), Before-Tax Amount		14,651	$ 372
Amortization of prior service credits and net actuarial loss, Tax (Provision) Benefit		(76)	(138)
Proportionate share of Telesat Holdco other comprehensive income (loss), Tax (Provision) Benefit		(5,416)
Other comprehensive income, Tax (Provision) Benefit		(5,492)	(138)
Amortization of prior service credits and net actuarial gain (loss), Net-of-Tax Amount		127	234
Proportionate share of Telesat Holdco other comprehensive income (loss), Net-of-Tax Amount		9,032
Other comprehensive income (loss), Net-of-Tax Amount		$ 9,159	$ 234

[1] Reclassifications are included in general and administrative expenses.

[2] See Note 6 for discussion of our share of Telesat other comprehensive income