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Intangible Assets, Net (Gross and Net Carrying Amounts for each Major Class of Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 6,548,716 | $ 6,647,824
Accumulated amortization | (3,564,618) | (3,491,674)
Net book value | 2,984,098 | 3,156,150
Current Contract Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 4,794,137 | 4,876,880
Accumulated amortization | (2,520,675) | (2,471,438)
Net book value | 2,273,462 | 2,405,442
Network Location Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,754,579 | 1,770,944
Accumulated amortization | (1,043,943) | (1,020,236)
Net book value | $ 710,636 | $ 750,708

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