Accumulated Other Comprehensive Loss (Schedule Of Other Comprehensive Income (Loss) And Related Income Tax Effects) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accumulated Other Comprehensive Loss [Abstract]
Unrealized loss on foreign currency hedges, net of tax benefit of $3,549 and $6,368 in 2011 and 2010, respectively	$ (5,272)	$ (9,422)	$ (94)
Less: reclassification adjustment for loss (gain) included in net income, net of tax provision of $7,216 in 2011 and tax benefit of $2,441 in 2010	10,719	(3,613)	(11,806)
Unrealized gain (loss) on derivatives, net	5,447	(13,035)	(11,900)
Unrealized gain (loss) on available-for-sale securities, net of tax benefit of $360 in 2011 and tax provision of $230 in 2010	(535)	340	658
Net actuarial losses and prior service credits, net of tax benefit of $34,424 and $11,254 in 2011 and 2010, respectively	(51,172)	(16,637)	(179)
Amortization of actuarial gains and prior service credits, net of tax provision of $352 in 2011 and tax benefit of $415 in 2010	524	(614)	412
Postretirement benefits	(50,648)	(17,251)	233
Proportionate share of Telesat other comprehensive loss, net of tax benefit of $9,155 and $2,052 in 2011 and 2010, respectively	(12,866)	(3,049)	(5,139)
Other comprehensive loss	(58,602)	(32,995)	(16,148)
Unrealized (loss) gain on foreign currency hedges, tax effect	3,549	6,368
Reclassification adjustment for foreign currency hedges, tax effect	(7,216)	2,441
Unrealized gain (loss) on available-for-sale securities, tax effect	360	(230)
Net actuarial losses and prior service credits, tax effect	34,424	11,254
Amortization of actuarial gains and prior service credits, tax effect	(352)	415
Proportionate share of Telesat Holdco other comprehensive income, tax effect	$ 8,651	$ 2,052