Intangible Assets, Net (Gross And Net Carrying Amounts For Each Major Class Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 5,305,854	$ 5,492,833
Accumulated amortization	(1,379,862)	(1,303,293)
Net book value	3,925,992	4,189,540
Current Contract Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross amount	3,926,022	4,090,129
Accumulated amortization	(946,412)	(891,374)
Net book value	2,979,610	3,198,755
Network Location Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross amount	1,379,832	1,402,704
Accumulated amortization	(433,450)	(411,919)
Net book value	$ 946,382	$ 990,785