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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the beginning of the period | $ 93,686 |  |
Balance at the end of the period | 114,083 | $ 93,686 |
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 | 93,686 | 93,686 |
Acquired licenses | 20,397 | 0 |
Dispositions | 0 | 0 |
Transfers | 0 |  |
Balance at the end of the period | 114,083 | 93,686 | 93,686
Telecommunications Licenses | International Telecom |  |  |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the beginning of the period | 23,347 | 23,347 |
Acquired licenses | 200 | 0 |
Dispositions | 0 | 0 |
Transfers | 11,251 |  |
Balance at the end of the period | 34,798 | 23,347 | 23,347
Telecommunications Licenses | US Telecom |  |  |
Changes in the carrying amount of the company's telecommunications licenses, by operating segment |  |  |
Balance at the beginning of the period | 70,339 | 70,339 |
Acquired licenses | 20,197 | 0 |
Dispositions | 0 | 0 |
Transfers | (11,251) |  |
Balance at the end of the period | $ 79,285 | $ 70,339 | $ 70,339

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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://fasb.org/us-gaap/role/ref/legacyRef -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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