SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment reporting
Number of reportable segments | segment	3
Revenue
Revenue	$ 172,019	$ 124,510
Depreciation	33,292	20,111
Amortization of intangibles from acquisitions	3,258	397
Non-cash stock-based compensation	1,461	1,336
Operating income (loss)	108	3,349
Segment Assets
Cash, cash equivalents, and short term investments	76,048		$ 79,901
Total current assets	220,841		232,617
Fixed assets, net	933,875		943,209
Goodwill	40,104		40,104
Total assets	1,590,707		1,608,604
Total current liabilities	184,726		220,944
Total debt	394,001		366,544
Capital Expenditures
Capital expenditures	34,468	25,680
Communication services
Revenue
Revenue	166,543	110,636
Mobility
Revenue
Revenue	25,416	24,681
Mobility - Business
Revenue
Revenue	3,990	1,773
Mobility - Consumer
Revenue
Revenue	21,426	22,908
Fixed
Revenue
Revenue	104,460	65,118
Fixed - Business
Revenue
Revenue	44,399	19,330
Fixed - Consumer
Revenue
Revenue	60,061	45,788
Carrier services
Revenue
Revenue	36,391	20,619
Other communication services
Revenue
Revenue	276	218
Construction.
Revenue
Revenue	1,987	12,306
Other revenue
Revenue
Revenue	3,489	1,568
Renewable Energy
Revenue
Revenue		418
Managed Services
Revenue
Revenue	3,489	1,150
Corporate and Other
Revenue
Depreciation	953	1,301
Non-cash stock-based compensation	1,311	1,262
Operating income (loss)	(7,037)	(8,571)
Segment Assets
Cash, cash equivalents, and short term investments	5,957		7,628
Total current assets	2,858		8,614
Fixed assets, net	9,320		10,103
Total assets	81,819		83,567
Total current liabilities	16,079		20,548
Total debt	71,500		61,499
Capital Expenditures
Capital expenditures	203	235
International Telecom | Operating segments
Revenue
Revenue	86,787	83,820
Depreciation	13,897	13,429
Amortization of intangibles from acquisitions	418	397
Non-cash stock-based compensation	60	37
Operating income (loss)	11,803	13,116
Segment Assets
Cash, cash equivalents, and short term investments	40,101		43,128
Total current assets	105,551		108,677
Fixed assets, net	448,064		452,856
Goodwill	4,835		4,835
Total assets	623,497		630,515
Total current liabilities	80,857		91,090
Total debt	63,342		64,243
Capital Expenditures
Capital expenditures	15,170	10,506
International Telecom | Operating segments | Communication services
Revenue
Revenue	85,611	82,670
International Telecom | Operating segments | Mobility
Revenue
Revenue	23,586	21,821
International Telecom | Operating segments | Mobility - Business
Revenue
Revenue	3,616	1,197
International Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	19,970	20,624
International Telecom | Operating segments | Fixed
Revenue
Revenue	58,347	58,748
International Telecom | Operating segments | Fixed - Business
Revenue
Revenue	17,254	16,634
International Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	41,093	42,114
International Telecom | Operating segments | Carrier services
Revenue
Revenue	3,402	1,883
International Telecom | Operating segments | Other communication services
Revenue
Revenue	276	218
International Telecom | Operating segments | Other revenue
Revenue
Revenue	1,176	1,150
International Telecom | Operating segments | Managed Services
Revenue
Revenue	1,176	1,150
US Telecom | Operating segments
Revenue
Revenue	85,232	40,272
Depreciation	18,442	5,193
Amortization of intangibles from acquisitions	2,840
Non-cash stock-based compensation	90	15
Operating income (loss)	(4,635)	(534)
Segment Assets
Cash, cash equivalents, and short term investments	29,285		28,486
Total current assets	108,779		111,741
Fixed assets, net	476,491		480,250
Goodwill	35,269		35,269
Total assets	868,338		877,041
Total current liabilities	87,434		108,950
Total debt	259,159		240,802
Capital Expenditures
Capital expenditures	19,095	14,939
US Telecom | Operating segments | Communication services
Revenue
Revenue	80,932	27,966
US Telecom | Operating segments | Mobility
Revenue
Revenue	1,830	2,860
US Telecom | Operating segments | Mobility - Business
Revenue
Revenue	374	576
US Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	1,456	2,284
US Telecom | Operating segments | Fixed
Revenue
Revenue	46,113	6,370
US Telecom | Operating segments | Fixed - Business
Revenue
Revenue	27,145	2,696
US Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	18,968	3,674
US Telecom | Operating segments | Carrier services
Revenue
Revenue	32,989	18,736
US Telecom | Operating segments | Construction.
Revenue
Revenue	1,987	12,306
US Telecom | Operating segments | Other revenue
Revenue
Revenue	2,313
US Telecom | Operating segments | Managed Services
Revenue
Revenue	2,313
Renewable Energy | Operating segments
Revenue
Revenue		418
Depreciation		188
Non-cash stock-based compensation		22
Operating income (loss)	(23)	(662)
Segment Assets
Cash, cash equivalents, and short term investments	705		659
Total current assets	3,653		3,585
Total assets	17,053		17,481
Total current liabilities	$ 356		$ 356
Renewable Energy | Operating segments | Other revenue
Revenue
Revenue		418
Renewable Energy | Operating segments | Renewable Energy
Revenue
Revenue		$ 418