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GOODWILL AND INTANGIBLE ASSETS - Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period		$ 63,970	$ 63,970
Acquisitions			0
Impairment		(3,279)	0	$ 0
Balance at the end of the period	$ 60,691	60,691	63,970	63,970
International Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period		24,326	24,326
Acquisitions			0
Impairment		0
Balance at the end of the period	24,326	24,326	24,326	24,326
US Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period		35,268	35,268
Acquisitions			0
Impairment		0
Balance at the end of the period	35,268	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		3,279	3,279
Acquisitions			0
Impairment	(3,300)	(3,279)
Balance at the end of the period	$ 0	$ 0	$ 3,279	$ 3,279

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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