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GOODWILL AND INTANGIBLE ASSETS - Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Oct. 01, 2023
Dec. 31, 2022
Changes in the carrying amount of goodwill, by operating segment      
Goodwill, Gross $ 60,691   $ 60,691
Accumulated impairment (20,587)   (20,587)
Goodwill, Total 40,104   40,104
International Telecom      
Changes in the carrying amount of goodwill, by operating segment      
Goodwill, Gross 25,423   25,423
Accumulated impairment (20,587)   (20,587)
Goodwill, Total 4,836   4,836
US Telecom      
Changes in the carrying amount of goodwill, by operating segment      
Goodwill, Gross 35,268   35,268
Goodwill, Total $ 35,268 $ 35,300 $ 35,268