Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income and Related Tax Effects) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain (loss) and prior service credits, Before-Tax Amount	$ (564)		$ (564)
Reclassification of prior service credits and net actuarial (gain) loss, Before-Tax Amount	1,559	2,012	4,573	6,036
Post Retirement Benefits, Before-Tax Amount	995	2,012	4,009	6,036
Proportionate share of Telesat Holdco other comprehensive income (loss), Before-Tax Amount	(127)	736	(127)	775
Unrealized gain (loss) on foreign currency hedges, Before-Tax Amount		(213)		(498)
Less: reclassification adjustment for (income) loss included in net income (loss) from discontinued operations, Before-Tax Amount		1,134		6,290
Net unrealized gain (loss) on derivatives, Before-Tax Amount		921		5,792
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount		138		(79)
Other comprehensive income (loss), Before-Tax Amount	868	3,807	3,882	12,524
Net actuarial gain (loss) and prior service credits, Tax (Expense) Benefit	245		245
Reclassification of prior service credits and net actuarial (gain) loss, Tax (Expense) Benefit	(631)	(806)	(1,782)	(2,423)
Post Retirement Benefits, Tax (Expense) Benefit	(386)	(806)	(1,537)	(2,423)
Proportionate share of Telesat Holdco other comprehensive income (loss), Tax (Expense) Benefit	44	(292)	44	(310)
Unrealized gain (loss) on foreign currency hedges, Tax (Expense) Benefit		85		200
Less: reclassification adjustment for (gain) loss included in net income from discontinued operations, Tax (Expense) Benefit		(453)		(2,526)
Net unrealized gain (loss) on derivatives , Tax (Expense) Benefit		(368)		(2,326)
Unrealized gain (loss) on available-for-sale securities , Tax (Expense) Benefit		(56)		31
Other comprehensive income (loss), Tax (Expense) Benefit	(342)	(1,522)	(1,493)	(5,028)
Net actuarial gain (loss) and prior service credits, Net-of Tax Amount	(319)		(319)
Amortization of prior service credits and net actuarial gain (loss), Net-of Tax Amount	928	1,206	2,791	3,613
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	609	1,206	2,472	3,613
Proportionate share of Telesat Holdco other comprehensive income (loss)	(83)	444	(83)	465
Unrealized gaiin (loss) on foreign currency hedges, Net-of Tax Amount		(128)		(298)
Less: reclassification adjustment for (gain) loss included in net income (loss) from discontinued operations, Net-of Tax Amount		681		3,764
Net unrealized gain (loss) on derivatives, Net-of Tax Amount		553		3,466
Unrealized gain (loss) on available-for-sale securities, Net-of Tax Amount		82		(48)
Other comprehensive income (loss), Net-of Tax Amount	$ 526	$ 2,285	$ 2,389	$ 7,496	$ 117,081