Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income and Related Tax Effects) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Loss [Abstract]
Amortization of prior service credits and net actuarial loss, Before-Tax Amount	[1]	$ 255	$ 481	$ 458	$ 853
Proportionate share of Telesat Holdco other comprehensive income (loss), Before-Tax Amount	[2]	494	1,318	14,942	1,318
Other comprehensive income (loss), Before-Tax Amount		749	1,799	15,400	2,171
Amortization of prior service credits and net actuarial loss, Tax (Provision) Benefit		(97)	(180)	(173)	(318)
Proportionate share of Telesat Holdco other comprehensive income (loss), Tax (Provision) Benefit		(235)	(491)	(5,651)	(491)
Other comprehensive income, Tax (Provision) Benefit		(332)	(671)	(5,824)	(809)
Amortization of prior service credits and net actuarial gain (loss), Net-of-Tax Amount		158	301	285	535
Proportionate share of Telesat Holdco other comprehensive income (loss), Net-of-Tax Amount		259	827	9,291	827
Other comprehensive income (loss), Net-of-Tax Amount		$ 417	$ 1,128	$ 9,576	$ 1,362

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

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