Intangible Assets, Net (Net Carrying Amounts For Each Major Class Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 2,163,468	$ 1,890,611
Accumulated amortization	(523,684)	(390,599)
Net book value	1,639,784	1,500,012
Current Contract Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,391,001	1,206,114
Accumulated amortization	(333,522)	(248,308)
Net book value	1,057,479	957,806
Network Location Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	772,467	684,497
Accumulated amortization	(190,162)	(142,291)
Net book value	$ 582,305	$ 542,206