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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment reporting
Number of reportable segments | segment									3
Revenue
Revenue	$ 112,085	$ 115,616	$ 107,721	$ 103,300	$ 107,806	$ 121,138	$ 117,788	$ 104,475	$ 438,722	$ 451,207	$ 481,193
Depreciation and amortization									89,125	85,719	86,934
Non-cash stock-based compensation									6,384	6,420	6,977
Operating income (loss)	(1,739)	$ 10,248	$ 2,754	$ 2,114	10,318	$ 30,743	$ 15,753	4,209	13,377	61,023	55,308
Segment Assets
Cash, Cash equivalents, and Investments	161,703				192,229				161,703	192,229
Total current assets	228,723				275,765				228,723	275,765
Fixed assets, net	605,581				626,852				605,581	626,852
Goodwill	60,691				63,970				60,691	63,970	63,970
Total assets	1,130,726				1,107,304				1,130,726	1,107,304
Total current liabilities	119,669				140,650				119,669	140,650
Total debt	86,426				90,982				86,426	90,982
Capital Expenditures
Capital expenditures									72,725	185,921
Hurricane rebuild capital expenditures									123	80,152	8,585
Hurricane insurance proceeds										34,606
Wireless
Revenue
Revenue									193,488	198,824	232,501
Wireline
Revenue
Revenue									239,700	230,225	227,827
Renewable Energy
Revenue
Revenue									5,534	22,158	20,865
Corporate and Other
Revenue
Depreciation and amortization									6,708	5,626	4,658
Non-cash stock-based compensation									5,892	6,227	6,675
Operating income (loss)									(34,365)	(34,252)	(33,496)
Segment Assets
Cash, Cash equivalents, and Investments	55,284				78,043				55,284	78,043
Total current assets	55,485				83,107				55,485	83,107
Fixed assets, net	21,453				20,381				21,453	20,381
Total assets	184,419				181,789				184,419	181,789
Total current liabilities	14,375				38,827				14,375	38,827
Capital Expenditures
Capital expenditures									6,758	8,004
International Telecom
Segment Assets
Goodwill	24,326				24,326				24,326	24,326	24,326
International Telecom | Operating segments
Revenue
Revenue									324,540	313,569	304,605
Depreciation and amortization									55,993	48,889	50,007
Non-cash stock-based compensation									405	88	188
Operating income (loss)									46,921	45,022	28,308
Segment Assets
Cash, Cash equivalents, and Investments	43,125				32,390				43,125	32,390
Total current assets	91,497				75,304				91,497	75,304
Fixed assets, net	466,523				482,770				466,523	482,770
Goodwill	25,421				25,421				25,421	25,421
Total assets	647,228				622,454				647,228	622,454
Total current liabilities	77,644				82,575				77,644	82,575
Total debt	86,426				90,970				86,426	90,970
Capital Expenditures
Capital expenditures									42,029	160,013
Hurricane rebuild capital expenditures										82,100
Hurricane insurance proceeds								$ 34,600
International Telecom | Operating segments | Wireless
Revenue
Revenue									88,054	89,946	89,473
International Telecom | Operating segments | Wireline
Revenue
Revenue									236,486	223,623	215,132
US Telecom
Segment Assets
Goodwill	35,268				35,268				35,268	35,268	35,268
US Telecom | Operating segments
Revenue
Revenue									108,648	115,480	155,723
Depreciation and amortization									23,119	24,615	25,601
Operating income (loss)									8,064	36,813	55,317
Segment Assets
Cash, Cash equivalents, and Investments	38,240				19,118				38,240	19,118
Total current assets	54,207				36,801				54,207	36,801
Fixed assets, net	69,184				78,102				69,184	78,102
Goodwill	35,270				35,269				35,270	35,269
Total assets	222,356				172,634				222,356	172,634
Total current liabilities	24,905				15,783				24,905	15,783
Capital Expenditures
Capital expenditures									17,490	13,389
US Telecom | Operating segments | Wireless
Revenue
Revenue									105,434	108,878	143,028
US Telecom | Operating segments | Wireline
Revenue
Revenue									3,214	6,602	12,695
Renewable Energy
Segment Assets
Goodwill	0				3,279				0	3,279	3,279
Renewable Energy | Operating segments
Revenue
Revenue									5,534	22,158	20,865
Depreciation and amortization									3,305	6,589	6,668
Non-cash stock-based compensation									87	105	114
Operating income (loss)									(7,243)	13,440	5,179
Segment Assets
Cash, Cash equivalents, and Investments	25,054				62,678				25,054	62,678
Total current assets	27,534				80,553				27,534	80,553
Fixed assets, net	48,421				45,599				48,421	45,599
Goodwill					3,280					3,280
Total assets	76,723				130,427				76,723	130,427
Total current liabilities	$ 2,745				3,465				2,745	3,465
Total debt					$ 12					12
Capital Expenditures
Capital expenditures									6,448	4,515
Renewable Energy | Operating segments | Renewable Energy
Revenue
Revenue									$ 5,534	$ 22,158	$ 20,865

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