Intangible Assets, Net (Gross and Net Carrying Amounts for each Major Class of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 6,949,646	$ 6,674,067
Accumulated amortization	(4,039,857)	(3,870,820)
Net book value	2,909,789	2,803,247
Current Contract Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,113,444	4,890,427
Accumulated amortization	(2,881,988)	(2,749,594)
Net book value	2,231,456	2,140,833
Network Location Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,836,202	1,783,640
Accumulated amortization	(1,157,869)	(1,121,226)
Net book value	$ 678,333	$ 662,414