SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment reporting
Number of reportable segments | segment			2
Revenue
Revenue	$ 186,441	$ 179,497	$ 372,214	$ 351,517
Depreciation and amortization	36,217	33,817	72,621	67,109
Amortization of intangibles from acquisitions	3,144	3,250	6,391	6,508
Non-cash stock-based compensation	2,739	2,568	4,517	4,028
Operating income (loss)	2,440	1,722	3,074	1,833
Segment Assets
Cash, cash equivalents, and restricted cash	67,222	72,160	67,222	72,160	$ 59,728	$ 80,697
Total current assets	248,096		248,096		229,688
Fixed assets, net	1,063,464		1,063,464		1,055,954
Goodwill	40,104		40,104		40,104
Total assets	1,729,969		1,729,969		1,707,869
Total current liabilities	240,842		240,842		233,180
Total debt	528,598		528,598		467,248
Capital Expenditures
Capital expenditures			96,437	75,098
Communication services
Revenue
Revenue	181,576	171,795	362,883	338,338
Mobility
Revenue
Revenue	27,833	26,804	55,099	52,220
Mobility - Business
Revenue
Revenue	3,621	3,976	7,369	7,965
Mobility - Consumer
Revenue
Revenue	24,212	22,828	47,730	44,255
Fixed
Revenue
Revenue	117,776	109,381	235,567	213,843
Fixed - Business
Revenue
Revenue	52,709	48,862	106,141	93,261
Fixed - Consumer
Revenue
Revenue	65,067	60,519	129,426	120,582
Carrier services
Revenue
Revenue	35,455	35,174	71,230	71,565
Other communication services
Revenue
Revenue	512	436	987	710
Construction.
Revenue
Revenue	1,020	3,297	1,610	5,283
Other revenue
Revenue
Revenue	3,845	4,405	7,721	7,896
Managed Services
Revenue
Revenue	3,845	4,405	7,721	7,896
Corporate and Other
Revenue
Depreciation and amortization	681	980	1,412	1,933
Non-cash stock-based compensation	2,621	2,433	4,255	3,743
Operating income (loss)	(9,718)	(9,643)	(18,566)	(16,703)
Segment Assets
Cash, cash equivalents, and restricted cash	8,457		8,457		6,935
Total current assets	10,035		10,035		8,326
Fixed assets, net	6,083		6,083		7,538
Total assets	85,787		85,787		83,662
Total current liabilities	28,276		28,276		26,687
Total debt	138,000		138,000		99,000
Capital Expenditures
Capital expenditures				424
International Telecom | Operating segments
Revenue
Revenue	91,981	88,406	182,389	175,191
Depreciation and amortization	14,106	15,074	28,292	28,971
Amortization of intangibles from acquisitions	364	394	744	812
Non-cash stock-based compensation	109	56	176	116
Operating income (loss)	14,552	11,646	28,377	23,450
Segment Assets
Cash, cash equivalents, and restricted cash	33,332		33,332		26,418
Total current assets	116,153		116,153		105,324
Fixed assets, net	472,548		472,548		462,447
Goodwill	4,835		4,835		4,835
Total assets	668,185		668,185		643,664
Total current liabilities	88,950		88,950		86,738
Total debt	63,478		63,478		59,659
Capital Expenditures
Capital expenditures			38,906	33,870
International Telecom | Operating segments | Communication services
Revenue
Revenue	90,856	87,160	179,944	172,769
International Telecom | Operating segments | Mobility
Revenue
Revenue	26,856	24,954	52,963	48,540
International Telecom | Operating segments | Mobility - Business
Revenue
Revenue	3,507	3,675	7,083	7,291
International Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	23,349	21,279	45,880	41,249
International Telecom | Operating segments | Fixed
Revenue
Revenue	59,673	58,349	118,563	116,696
International Telecom | Operating segments | Fixed - Business
Revenue
Revenue	17,214	16,996	34,327	34,250
International Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	42,459	41,353	84,236	82,446
International Telecom | Operating segments | Carrier services
Revenue
Revenue	3,879	3,421	7,570	6,823
International Telecom | Operating segments | Other communication services
Revenue
Revenue	448	436	848	710
International Telecom | Operating segments | Other revenue
Revenue
Revenue	1,125	1,246	2,445	2,422
International Telecom | Operating segments | Managed Services
Revenue
Revenue	1,125	1,246	2,445	2,422
US Telecom | Operating segments
Revenue
Revenue	94,460	91,091	189,825	176,326
Depreciation and amortization	21,430	17,763	42,917	36,205
Amortization of intangibles from acquisitions	2,780	2,856	5,647	5,696
Non-cash stock-based compensation	9	79	86	169
Operating income (loss)	(2,394)	(281)	(6,737)	(4,914)
Segment Assets
Cash, cash equivalents, and restricted cash	25,433		25,433		26,375
Total current assets	121,908		121,908		116,038
Fixed assets, net	584,833		584,833		585,969
Goodwill	35,269		35,269		35,269
Total assets	975,997		975,997		980,543
Total current liabilities	123,616		123,616		119,755
Total debt	327,120		327,120		$ 308,589
Capital Expenditures
Capital expenditures			57,531	40,804
US Telecom | Operating segments | Communication services
Revenue
Revenue	90,720	84,635	182,939	165,569
US Telecom | Operating segments | Mobility
Revenue
Revenue	977	1,850	2,136	3,680
US Telecom | Operating segments | Mobility - Business
Revenue
Revenue	114	301	286	674
US Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	863	1,549	1,850	3,006
US Telecom | Operating segments | Fixed
Revenue
Revenue	58,103	51,032	117,004	97,147
US Telecom | Operating segments | Fixed - Business
Revenue
Revenue	35,495	31,866	71,814	59,011
US Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	22,608	19,166	45,190	38,136
US Telecom | Operating segments | Carrier services
Revenue
Revenue	31,576	31,753	63,660	64,742
US Telecom | Operating segments | Other communication services
Revenue
Revenue	64		139
US Telecom | Operating segments | Construction.
Revenue
Revenue	1,020	3,297	1,610	5,283
US Telecom | Operating segments | Other revenue
Revenue
Revenue	2,720	3,159	5,276	5,474
US Telecom | Operating segments | Managed Services
Revenue
Revenue	$ 2,720	$ 3,159	$ 5,276	$ 5,474