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GOODWILL AND INTANGIBLE ASSETS - Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in the carrying amount of goodwill, by operating segment
Goodwill, Gross	$ 63,970	$ 63,970
Accumulated impairment	0	0
Goodwill, Total	63,970	63,970	$ 62,873
U.S. Telecom
Changes in the carrying amount of goodwill, by operating segment
Goodwill, Gross	35,268	35,268
Accumulated impairment	0	0
Goodwill, Total	35,268	35,268	35,268
International Telecom
Changes in the carrying amount of goodwill, by operating segment
Goodwill, Gross	25,423	25,423
Accumulated impairment	0	0
Goodwill, Total	25,423	25,423	24,326
Renewable Energy
Changes in the carrying amount of goodwill, by operating segment
Goodwill, Gross	3,279	3,279
Accumulated impairment	0	0
Goodwill, Total	$ 3,279	$ 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
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Amount before 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 350
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-Paragraph 1
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