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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment reporting
Number of reportable segments | segment									3
Revenue
Revenue	$ 107,806	$ 121,138	$ 117,788	$ 104,475	$ 107,701	$ 122,132	$ 123,245	$ 128,115	$ 451,207	$ 481,193	$ 457,003
Depreciation and amortization									85,719	86,934	75,980
Non-cash stock-based compensation									6,420	6,977	6,410
Operating income (loss)	10,318	$ 30,743	$ 15,753	$ 4,209	41,314	$ (19,565)	$ 15,803	$ 17,756	61,023	55,308	51,270
Segment Assets
Cash, Cash equivalents, and Investments	192,229				215,032				192,229	215,032
Total current assets	275,765				342,928				275,765	342,928
Fixed assets, net	626,852				643,146				626,852	643,146
Goodwill	63,970				63,970				63,970	63,970	62,873
Total assets	1,107,304				1,205,605				1,107,304	1,205,605
Total current liabilities	140,650				161,705				140,650	161,705
Total debt	90,982				155,792				90,982	155,792
Capital Expenditures
Capital expenditures									185,921	142,371
Hurricane rebuild capital expenditures									80,152	8,585
Hurricane insurance proceeds									34,606
Wireless
Revenue
Revenue									198,824	232,501	244,404
Wireline
Revenue
Revenue									230,225	227,827	190,598
Renewable Energy
Revenue
Revenue									22,158	20,865	22,001
Corporate and Other
Revenue
Depreciation and amortization									5,626	4,658	6,030
Non-cash stock-based compensation									6,227	6,675	6,274
Operating income (loss)									(34,252)	(33,496)	(34,472)
Segment Assets
Cash, Cash equivalents, and Investments	78,043				76,627				78,043	76,627
Total current assets	83,107				93,497				83,107	93,497
Fixed assets, net	20,381				17,752				20,381	17,752
Total assets	181,789				184,050				181,789	184,050
Total current liabilities	38,827				13,816				38,827	13,816
Capital Expenditures
Capital expenditures									8,004	6,491
U.S. Telecom
Segment Assets
Goodwill	35,268				35,268				35,268	35,268	35,268
U.S. Telecom | Operating segments
Revenue
Revenue									115,480	155,723	176,727
Depreciation and amortization									24,615	25,601	24,470
Operating income (loss)									36,813	55,317	49,078
Segment Assets
Cash, Cash equivalents, and Investments	19,118				19,585				19,118	19,585
Total current assets	36,801				40,975				36,801	40,975
Fixed assets, net	78,102				99,462				78,102	99,462
Goodwill	35,269				35,269				35,269	35,269
Total assets	172,634				200,142				172,634	200,142
Total current liabilities	15,783				41,248				15,783	41,248
Capital Expenditures
Capital expenditures									13,389	22,230
U.S. Telecom | Operating segments | Wireless
Revenue
Revenue									108,878	143,028	150,044
U.S. Telecom | Operating segments | Wireline
Revenue
Revenue									6,602	12,695	26,683
International Telecom
Segment Assets
Goodwill	25,423				25,423				25,423	25,423	24,326
International Telecom | Operating segments
Revenue
Revenue									313,569	304,605	258,275
Depreciation and amortization									48,889	50,007	40,493
Non-cash stock-based compensation									88	188	22
Operating income (loss)									45,022	28,308	36,910
Segment Assets
Cash, Cash equivalents, and Investments	32,390				110,700				32,390	110,700
Total current assets	75,304				190,396				75,304	190,396
Fixed assets, net	482,770				367,485				482,770	367,485
Goodwill	25,421				25,421				25,421	25,421
Total assets	622,454				629,007				622,454	629,007
Total current liabilities	82,575				91,887				82,575	91,887
Total debt	90,970				94,577				90,970	94,577
Capital Expenditures
Capital expenditures									160,013	80,912
Hurricane rebuild capital expenditures									80,200
Hurricane insurance proceeds									34,600
International Telecom | Operating segments | Wireless
Revenue
Revenue									89,946	89,473	94,360
International Telecom | Operating segments | Wireline
Revenue
Revenue									223,623	215,132	163,915
Renewable Energy
Segment Assets
Goodwill	3,279				3,279				3,279	3,279	3,279
Renewable Energy | Operating segments
Revenue
Revenue									22,158	20,865	22,001
Depreciation and amortization									6,589	6,668	4,987
Non-cash stock-based compensation									105	114	114
Operating income (loss)									13,440	5,179	(246)
Segment Assets
Cash, Cash equivalents, and Investments	62,678				8,120				62,678	8,120
Total current assets	80,553				18,060				80,553	18,060
Fixed assets, net	45,599				158,447				45,599	158,447
Goodwill	3,280				3,280				3,280	3,280
Total assets	130,427				192,406				130,427	192,406
Total current liabilities	3,465				14,754				3,465	14,754
Total debt	$ 12				$ 61,215				12	61,215
Capital Expenditures
Capital expenditures									4,515	32,738
Renewable Energy | Operating segments | Renewable Energy
Revenue
Revenue									$ 22,158	$ 20,865	$ 22,001

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