Intangible Assets, Net (Gross And Net Carrying Amounts For Each Major Class Of Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 5,610,117	$ 5,351,157
Accumulated amortization	(1,821,363)	(1,615,744)
Net book value	3,788,754	3,735,413
Current Contract Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	4,112,204	3,904,864
Accumulated amortization	(1,270,749)	(1,118,493)
Net book value	2,841,455	2,786,371
Network Location Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,497,913	1,446,293
Accumulated amortization	(550,614)	(497,251)
Net book value	$ 947,299	$ 949,042