SEGMENT REPORTING (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment reporting
Number of reportable segments | segment	3
Revenue
Revenue	$ 602,707	$ 455,444	$ 438,722
Depreciation	102,731	86,504	86,963
Amortization of Intangible Assets	7,775	1,807	2,162
Non-cash stock-based compensation	6,581	5,912	6,384
Operating income (loss)	(15,026)	9,180	13,377
Segment Assets
Cash, cash equivalents, and short term investments	79,901	103,925
Total current assets	232,617	240,065
Fixed assets, net	943,209	536,462
Goodwill	40,104	60,691	60,691
Total assets	1,608,604	1,083,711
Total current liabilities	220,944	147,928
Total debt	366,544	72,823
Capital Expenditures
Capital expenditures	106,142	75,323
Communication services
Revenue
Revenue	549,620	433,509	428,108
Mobility
Revenue
Revenue	102,301	92,762	95,092
Mobility - Business
Revenue
Revenue	8,385	4,723	89,341
Mobility - Consumer
Revenue
Revenue	93,916	88,039	5,751
Fixed
Revenue
Revenue	328,643	252,644	238,745
Fixed - Business
Revenue
Revenue	120,741	78,013	141,596
Fixed - Consumer
Revenue
Revenue	207,902	174,631	97,149
Carrier services
Revenue
Revenue	117,730	86,568	92,976
Other communication services
Revenue
Revenue	946	1,535	1,295
Construction.
Revenue
Revenue	35,889	10,913
Other revenue
Revenue
Revenue	17,198	11,022	10,614
Renewable Energy
Revenue
Revenue	417	4,555	5,534
Managed Services
Revenue
Revenue	16,781	6,467	5,080
Corporate and Other
Revenue
Depreciation	5,081	6,486	6,708
Non-cash stock-based compensation	6,160	5,586	5,892
Operating income (loss)	(32,450)	(33,966)	(34,365)
Segment Assets
Cash, cash equivalents, and short term investments	7,628	26,845
Total current assets	8,614	27,887
Fixed assets, net	10,103	12,857
Total assets	83,567	136,035
Total current liabilities	20,548	22,815
Total debt	61,499
Capital Expenditures
Capital expenditures	2,922	3,613
International Telecom
Segment Assets
Goodwill	4,836	25,423	25,423
International Telecom | Operating segments
Revenue
Revenue	342,859	328,633	324,539
Depreciation	53,858	54,477	53,831
Amortization of Intangible Assets	1,648	1,807	2,162
Non-cash stock-based compensation	128	49	405
Operating income (loss)	33,899	58,924	46,921
Segment Assets
Cash, cash equivalents, and short term investments	43,128	45,848
Total current assets	108,677	107,315
Fixed assets, net	452,856	449,888
Goodwill	4,835	25,421
Total assets	630,515	642,834
Total current liabilities	91,090	80,875
Total debt	64,243	72,823
Capital Expenditures
Capital expenditures	49,985	38,895
International Telecom | Operating segments | Communication services
Revenue
Revenue	337,713	322,166	319,459
International Telecom | Operating segments | Mobility
Revenue
Revenue	93,367	83,136	84,560
International Telecom | Operating segments | Mobility - Business
Revenue
Revenue	6,983	4,319	78,819
International Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	86,384	78,817	5,741
International Telecom | Operating segments | Fixed
Revenue
Revenue	233,463	230,375	224,534
International Telecom | Operating segments | Fixed - Business
Revenue
Revenue	67,458	67,776	137,476
International Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	166,005	162,599	87,058
International Telecom | Operating segments | Carrier services
Revenue
Revenue	9,937	7,120	9,070
International Telecom | Operating segments | Other communication services
Revenue
Revenue	946	1,535	1,295
International Telecom | Operating segments | Other revenue
Revenue
Revenue	5,146	6,467	5,080
International Telecom | Operating segments | Managed Services
Revenue
Revenue	5,146	6,467	5,080
US Telecom
Segment Assets
Goodwill	35,268	35,268	35,268
US Telecom | Operating segments
Revenue
Revenue	259,431	122,256	108,649
Depreciation	43,604	23,325	23,119
Amortization of Intangible Assets	6,127
Non-cash stock-based compensation	271	15
Operating income (loss)	(14,016)	7,971	8,064
Segment Assets
Cash, cash equivalents, and short term investments	28,486	26,921
Total current assets	111,741	65,806
Fixed assets, net	480,250	73,717
Goodwill	35,269	35,270
Total assets	877,041	265,797
Total current liabilities	108,950	43,200
Total debt	240,802
Capital Expenditures
Capital expenditures	53,235	29,883
US Telecom | Operating segments | Communication services
Revenue
Revenue	211,907	111,343	108,649
US Telecom | Operating segments | Mobility
Revenue
Revenue	8,934	9,626	10,532
US Telecom | Operating segments | Mobility - Business
Revenue
Revenue	1,402	404	10,522
US Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	7,532	9,222	10
US Telecom | Operating segments | Fixed
Revenue
Revenue	95,180	22,269	14,211
US Telecom | Operating segments | Fixed - Business
Revenue
Revenue	53,283	10,237	4,120
US Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	41,897	12,032	10,091
US Telecom | Operating segments | Carrier services
Revenue
Revenue	107,793	79,448	83,906
US Telecom | Operating segments | Construction.
Revenue
Revenue	35,889	10,913
US Telecom | Operating segments | Other revenue
Revenue
Revenue	11,635
US Telecom | Operating segments | Managed Services
Revenue
Revenue	11,635
Renewable Energy
Segment Assets
Goodwill			0
Renewable Energy | Operating segments
Revenue
Revenue	417	4,555	5,534
Depreciation	188	2,216	3,305
Non-cash stock-based compensation	22	262	87
Operating income (loss)	(2,459)	(23,749)	(7,243)
Segment Assets
Cash, cash equivalents, and short term investments	659	4,311
Total current assets	3,585	39,057
Total assets	17,481	39,045
Total current liabilities	356	1,038
Capital Expenditures
Capital expenditures		2,932
Renewable Energy | Operating segments | Other revenue
Revenue
Revenue	417	4,555	5,534
Renewable Energy | Operating segments | Renewable Energy
Revenue
Revenue	$ 417	$ 4,555	$ 5,534