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GOODWILL AND INTANGIBLE ASSETS - Net (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Changes in the carrying amount of goodwill, by operating segment
Gross	$ 60,691		$ 60,691
Accumulated Impairment	(55,856)		(20,587)
Goodwill, net of accumulated impairment	4,835		40,104
International Telecom
Changes in the carrying amount of goodwill, by operating segment
Gross	25,422		25,423
Accumulated Impairment	(20,587)		(20,587)
Goodwill, net of accumulated impairment	4,835		4,836
US Telecom
Changes in the carrying amount of goodwill, by operating segment
Gross	35,269		35,268
Accumulated Impairment	(35,269)
Goodwill, net of accumulated impairment	$ 0	$ 35,300	$ 35,268

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