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Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Intangible Assets, Net [Abstract] |
Gross and Net Carrying Amounts for each Major Class of Intangible Assets |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | As of December 31, 2018 |  | As of December 31, 2017
﻿ |  | Gross carrying |  | Accumulated |  | Net book |  | Gross carrying |  | Accumulated |  | Net book
﻿ |  | amount |  | amortization |  | value |  | amount |  | amortization |  | value
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | (in thousands)
﻿Current contract intangibles |  | $ | 4,394,416 |  | $ | (1,928,030) |  | $ | 2,466,386 |  | $ | 4,355,171 |  | $ | (1,673,270) |  | $ | 2,681,901
﻿Network location intangibles |  |  | 1,669,859 |  |  | (804,780) |  |  | 865,079 |  |  | 1,617,441 |  |  | (701,211) |  |  | 916,230
﻿Intangible assets, net |  | $ | 6,064,275 |  | $ | (2,732,810) |  | $ | 3,331,465 |  | $ | 5,972,612 |  | $ | (2,374,481) |  | $ | 3,598,131
﻿
Estimated Future Amortization Expense |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿For the year ended December 31, |  |  |  |  |  |  |  | (in thousands)
﻿ |  |  |  |  |  |  |  |  |
﻿2019 |  |  |  |  |  |  |  | $ | 403,371
﻿2020 |  |  |  |  |  |  |  |  | 402,447
﻿2021 |  |  |  |  |  |  |  |  | 369,864
﻿2022 |  |  |  |  |  |  |  |  | 349,657
﻿2023 |  |  |  |  |  |  |  |  | 327,181
﻿

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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