SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment reporting
Number of reportable segments | segment			2
Revenue
Revenue	$ 191,036	$ 182,213	$ 563,250	$ 533,730
Depreciation and amortization	34,370	33,312	106,991	100,421
Amortization of intangibles from acquisitions	3,124	3,236	9,514	9,744
Non-cash stock-based compensation	1,956	1,669	6,473	5,696
Operating income (loss)	6,836	1,439	9,911	3,272
Segment Assets
Cash, cash equivalents, and restricted cash	73,087	77,809	73,087	77,809	$ 59,728	$ 80,697
Total current assets	267,365		267,365		229,688
Fixed assets, net	1,069,433		1,069,433		1,055,954
Goodwill	40,104		40,104		40,104
Total assets	1,751,226		1,751,226		1,707,869
Total current liabilities	262,657		262,657		233,180
Total debt, including current portion	498,377		498,377		421,900
Capital Expenditures
Capital expenditures			140,901	113,959
Government capital programs - Amounts disbursed			14,261	4,015
Communication services
Revenue
Revenue	184,601	173,977	547,484	512,315
Mobility
Revenue
Revenue	28,736	28,838	83,835	81,058
Mobility - Business
Revenue
Revenue	3,946	4,004	11,899	11,970
Mobility - Consumer
Revenue
Revenue	24,790	24,834	71,936	69,088
Fixed
Revenue
Revenue	118,325	110,219	353,892	324,062
Fixed - Business
Revenue
Revenue	53,696	51,087	160,096	144,348
Fixed - Consumer
Revenue
Revenue	64,629	59,132	193,796	179,714
Carrier services
Revenue
Revenue	35,760	34,580	106,989	106,144
Other communication services
Revenue
Revenue	1,780	340	2,768	1,051
Construction.
Revenue
Revenue	2,038	3,332	3,648	8,615
Other revenue
Revenue
Revenue	4,397	4,904	12,118	12,800
Managed Services
Revenue
Revenue	4,397	4,904	12,118	12,800
Corporate and Other
Revenue
Depreciation and amortization	618	845	2,030	2,766
Non-cash stock-based compensation	1,803	1,483	6,057	5,225
Operating income (loss)	(8,981)	(12,637)	(27,547)	(29,418)
Segment Assets
Cash, cash equivalents, and restricted cash	5,821		5,821		6,935
Total current assets	8,197		8,197		8,326
Fixed assets, net	5,455		5,455		7,538
Total assets	83,528		83,528		83,662
Total current liabilities	32,127		32,127		26,687
Total debt, including current portion	149,326		149,326		99,000
Capital Expenditures
Capital expenditures				633
International Telecom | Operating segments
Revenue
Revenue	93,878	90,007	276,267	265,197
Depreciation and amortization	14,354	14,126	42,646	43,109
Amortization of intangibles from acquisitions	240	380	984	1,192
Non-cash stock-based compensation	130	54	307	170
Operating income (loss)	12,800	13,360	41,177	36,889
Segment Assets
Cash, cash equivalents, and restricted cash	35,588		35,588		26,418
Total current assets	115,888		115,888		105,324
Fixed assets, net	476,355		476,355		462,447
Goodwill	4,835		4,835		4,835
Total assets	671,285		671,285		643,664
Total current liabilities	82,178		82,178		86,738
Total debt, including current portion	63,209		63,209		59,659
Capital Expenditures
Capital expenditures			57,610	53,270
International Telecom | Operating segments | Communication services
Revenue
Revenue	92,451	88,609	272,395	261,377
International Telecom | Operating segments | Mobility
Revenue
Revenue	27,791	26,482	80,754	75,022
International Telecom | Operating segments | Mobility - Business
Revenue
Revenue	3,818	3,706	11,484	10,997
International Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	23,973	22,776	69,270	64,025
International Telecom | Operating segments | Fixed
Revenue
Revenue	59,983	58,567	178,546	175,262
International Telecom | Operating segments | Fixed - Business
Revenue
Revenue	18,016	18,578	52,602	52,827
International Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	41,967	39,989	125,944	122,435
International Telecom | Operating segments | Carrier services
Revenue
Revenue	3,441	3,220	11,011	10,042
International Telecom | Operating segments | Other communication services
Revenue
Revenue	1,236	340	2,084	1,051
International Telecom | Operating segments | Other revenue
Revenue
Revenue	1,427	1,398	3,872	3,820
International Telecom | Operating segments | Managed Services
Revenue
Revenue	1,427	1,398	3,872	3,820
US Telecom | Operating segments
Revenue
Revenue	97,158	92,206	286,983	268,533
Depreciation and amortization	19,398	18,341	62,315	54,546
Amortization of intangibles from acquisitions	2,884	2,856	8,530	8,552
Non-cash stock-based compensation	23	132	109	301
Operating income (loss)	3,017	716	(3,719)	(4,199)
Segment Assets
Cash, cash equivalents, and restricted cash	31,678		31,678		26,375
Total current assets	143,280		143,280		116,038
Fixed assets, net	587,623		587,623		585,969
Goodwill	35,269		35,269		35,269
Total assets	996,413		996,413		980,543
Total current liabilities	148,352		148,352		119,755
Total debt, including current portion	285,842		285,842		$ 263,241
Capital Expenditures
Capital expenditures			83,291	60,056
US Telecom | Operating segments | Communication services
Revenue
Revenue	92,150	85,368	275,089	250,938
US Telecom | Operating segments | Mobility
Revenue
Revenue	945	2,356	3,081	6,036
US Telecom | Operating segments | Mobility - Business
Revenue
Revenue	128	298	415	973
US Telecom | Operating segments | Mobility - Consumer
Revenue
Revenue	817	2,058	2,666	5,063
US Telecom | Operating segments | Fixed
Revenue
Revenue	58,342	51,652	175,346	148,800
US Telecom | Operating segments | Fixed - Business
Revenue
Revenue	35,680	32,509	107,494	91,521
US Telecom | Operating segments | Fixed - Consumer
Revenue
Revenue	22,662	19,143	67,852	57,279
US Telecom | Operating segments | Carrier services
Revenue
Revenue	32,319	31,360	95,978	96,102
US Telecom | Operating segments | Other communication services
Revenue
Revenue	544		684
US Telecom | Operating segments | Construction.
Revenue
Revenue	2,038	3,332	3,648	8,615
US Telecom | Operating segments | Other revenue
Revenue
Revenue	2,970	3,506	8,246	8,980
US Telecom | Operating segments | Managed Services
Revenue
Revenue	$ 2,970	$ 3,506	$ 8,246	$ 8,980