GOODWILL AND INTANGIBLE ASSETS - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	$ 60,691	$ 60,691
Impairment	(20,587)	0	$ (3,279)
Balance at the end of the period	40,104	60,691	60,691
International Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	25,423	25,423
Impairment	(20,587)	0
Balance at the end of the period	4,836	25,423	25,423
US Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	35,268	35,268
Impairment	0	0
Balance at the end of the period	$ 35,268	35,268	35,268
Renewable Energy
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period		$ 0
Impairment			(3,300)
Balance at the end of the period			$ 0