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GOODWILL AND INTANGIBLE ASSETS - Change In Carrying Amount Of Telecommunications Licenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |
Balance at the beginning of the period | $ 48,291 |
Balance at the end of the period | 95,952 | $ 48,291
Telecommunications Licenses |  |
Telecommunications licenses |  |
Impairment of intangible assets | 0 | 0
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |
Balance at the beginning of the period | 48,291 | 43,468
Deconsolidation of subsidiary |  | (2,178)
Acquired licenses | 47,692 | 7,623
Amortization |  | (622)
Dispositions | (31) |
Balance at the end of the period | 95,952 | 48,291
Telecommunications Licenses | U.S. Telecom |  |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |
Balance at the beginning of the period | 24,944 | 24,944
Acquired licenses | 47,692 |
Dispositions | (31) |
Balance at the end of the period | 72,605 | 24,944
Telecommunications Licenses | International |  |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |
Balance at the beginning of the period | 23,347 | 18,524
Deconsolidation of subsidiary |  | (2,178)
Acquired licenses |  | 7,623
Amortization |  | (622)
Balance at the end of the period | $ 23,347 | $ 23,347

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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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