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GOODWILL AND INTANGIBLE ASSETS - Rollforward (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	$ 60,691
Impairment	(20,587)
Balance at the end of the period	40,104
International Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	25,423
Impairment	(20,587)
Balance at the end of the period	4,836
US Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	35,268
Impairment	0
Balance at the end of the period	$ 35,268

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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