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GOODWILL AND INTANGIBLE ASSETS - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	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	$ 62,873
Acquisitions	0	1,097
Balance at the end of the period	63,970	63,970
U.S. Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	35,268	35,268
Acquisitions	0	0
Balance at the end of the period	35,268	35,268
International Telecom
Changes in the carrying amount of goodwill, by operating segment
Balance at the beginning of the period	25,423	24,326
Acquisitions	0	1,097
Balance at the end of the period	25,423	25,423
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	0
Balance at the end of the period	$ 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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