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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment reporting
Number of reportable segments | segment	3
Revenue
Revenue	$ 124,510	$ 110,905
Depreciation and amortization	20,508	22,518
Non-cash stock-based compensation	1,336	1,160
Operating income (loss)	3,349	7,299
Segment Assets
Cash, Cash equivalents, and Investments	91,259		$ 103,925
Total current assets	195,277		240,065
Fixed assets, net	528,071		536,462
Goodwill	60,690		60,691
Total assets	1,057,722		1,083,711
Total current liabilities	127,756		147,928
Total debt	82,737		72,823
Capital Expenditures
Capital expenditures	25,680	14,061
Communication services
Revenue
Revenue	110,636	107,904
Mobility
Revenue
Revenue	24,681	22,633
Fixed
Revenue
Revenue	65,118	62,566
Carrier services
Revenue
Revenue	20,619	22,369
Other
Revenue
Revenue	218	336
Other
Revenue
Revenue	13,874	3,001
Renewable Energy
Revenue
Revenue	418	1,322
Managed Services
Revenue
Revenue	1,150	1,679
Construction
Revenue
Revenue	12,306
Corporate and Other
Revenue
Depreciation and amortization	1,301	1,703
Non-cash stock-based compensation	1,262	1,197
Operating income (loss)	(8,571)	(7,915)
Segment Assets
Cash, Cash equivalents, and Investments	15,543		26,845
Total current assets	17,352		27,887
Fixed assets, net	11,552		12,857
Total assets	98,043		136,035
Total current liabilities	17,084		22,815
Capital Expenditures
Capital expenditures	235	904
International Telecom | Operating segments
Revenue
Revenue	83,820	82,284
Depreciation and amortization	13,826	14,315
Non-cash stock-based compensation	37	(37)
Operating income (loss)	13,116	13,477
Segment Assets
Cash, Cash equivalents, and Investments	40,505		45,848
Total current assets	100,470		107,315
Fixed assets, net	448,690		449,888
Goodwill	25,421		25,421
Total assets	634,344		642,834
Total current liabilities	77,100		80,875
Total debt	71,923		72,823
Capital Expenditures
Capital expenditures	10,506	10,465
International Telecom | Operating segments | Communication services
Revenue
Revenue	82,670	80,605
International Telecom | Operating segments | Mobility
Revenue
Revenue	21,821	20,230
International Telecom | Operating segments | Fixed
Revenue
Revenue	58,748	57,741
International Telecom | Operating segments | Carrier services
Revenue
Revenue	1,883	2,298
International Telecom | Operating segments | Other
Revenue
Revenue	218	336
International Telecom | Operating segments | Other
Revenue
Revenue	1,150	1,679
International Telecom | Operating segments | Managed Services
Revenue
Revenue	1,150	1,679
US Telecom | Operating segments
Revenue
Revenue	40,272	27,299
Depreciation and amortization	5,193	5,886
Non-cash stock-based compensation	15
Operating income (loss)	(534)	2,193
Segment Assets
Cash, Cash equivalents, and Investments	29,389		26,921
Total current assets	67,739		65,806
Fixed assets, net	67,829		73,717
Goodwill	35,269		35,270
Total assets	302,966		265,797
Total current liabilities	33,216		43,200
Total debt	10,814
Capital Expenditures
Capital expenditures	14,939	1,972
US Telecom | Operating segments | Communication services
Revenue
Revenue	27,966	27,299
US Telecom | Operating segments | Mobility
Revenue
Revenue	2,860	2,403
US Telecom | Operating segments | Fixed
Revenue
Revenue	6,370	4,825
US Telecom | Operating segments | Carrier services
Revenue
Revenue	18,736	20,071
US Telecom | Operating segments | Other
Revenue
Revenue	12,306
US Telecom | Operating segments | Construction
Revenue
Revenue	12,306
Renewable Energy | Operating segments
Revenue
Revenue	418	1,322
Depreciation and amortization	188	614
Non-cash stock-based compensation	22
Operating income (loss)	(662)	(456)
Segment Assets
Cash, Cash equivalents, and Investments	5,822		4,311
Total current assets	9,716		39,057
Total assets	22,369		39,045
Total current liabilities	356		$ 1,038
Capital Expenditures
Capital expenditures		720
Renewable Energy | Operating segments | Other
Revenue
Revenue	418	1,322
Renewable Energy | Operating segments | Renewable Energy
Revenue
Revenue	$ 418	$ 1,322

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