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Intangible Assets, Net (Gross and Net Carrying Amounts for each Major Class of Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 6,064,275 | $ 5,972,612
Accumulated amortization | (2,732,810) | (2,374,481)
Net book value | 3,331,465 | 3,598,131
Current Contract Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 4,394,416 | 4,355,171
Accumulated amortization | (1,928,030) | (1,673,270)
Net book value | 2,466,386 | 2,681,901
Network Location Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,669,859 | 1,617,441
Accumulated amortization | (804,780) | (701,211)
Net book value | $ 865,079 | $ 916,230

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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