Intangible Assets, Net (Gross And Net Carrying Amounts For Each Major Class Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 5,492,833	$ 4,363,758
Accumulated amortization	(1,303,293)	(976,560)
Net book value	4,189,540	3,387,198
Current Contract Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross amount	4,090,129	3,154,616
Accumulated amortization	(891,374)	(649,861)
Net book value	3,198,755	2,504,755
Network Location Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross amount	1,402,704	1,209,142
Accumulated amortization	(411,919)	(326,699)
Net book value	$ 990,785	$ 882,443