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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)
Segment reporting
Number of reportable segments | segment										5
Revenue
Revenue	$ 128,531	$ 138,795	$ 99,991	$ 89,686	$ 82,916	$ 96,782	$ 90,326	$ 85,345	$ 457,003	$ 355,369	$ 336,347
Depreciation and amortization									75,980	56,890	51,234
Non-cash stock-based compensation									6,410	4,975	4,323
Operating income (loss)	9,911	$ 22,081	$ 1,912	$ 15,893	8,181	$ 22,524	$ 28,732	$ 19,158	49,797	78,595	85,576
Segment Assets
Net fixed assets	647,712				373,503				647,712	373,503
Goodwill	62,873				45,077				62,873	45,077
Long Lived Assets	1,198,218				945,004				1,198,218	945,004
Capital Expenditures
Capital expenditures									124,282	64,753	58,300
Wireless
Revenue
Revenue									228,798	237,042	241,690
Wireline
Revenue
Revenue									188,019	86,485	85,284
Equipment and other
Revenue
Revenue									18,578	10,802	9,373
Renewable energy
Revenue
Revenue									21,608	21,040
U.S
Revenue
Revenue									198,300	204,024	180,841
Guyana
Revenue
Revenue									91,653	88,894	86,931
U.S Virgin Islands
Revenue
Revenue									58,431	11,542	11,583
Bermuda
Revenue
Revenue									83,006	45,745	46,917
Other Foreign Countries
Revenue
Revenue									25,613	5,164	10,075
Reconciling Items
Revenue
Depreciation and amortization									6,030	4,948	3,980
Non-cash stock-based compensation									6,274	4,708	4,323
Operating income (loss)									(34,471)	(30,784)	(26,399)
Segment Assets
Net fixed assets	15,429				14,085				15,429	14,085
Long Lived Assets	170,505				315,739				170,505	315,739
Capital Expenditures
Capital expenditures									6,876	4,323
U.S. Telecom
Segment Assets
Goodwill	35,268				39,639				35,268	39,639
U.S. Telecom | Operating segments
Revenue
Revenue									176,726	182,986	180,391
Depreciation and amortization									24,471	22,239	19,070
Operating income (loss)									49,078	74,459	85,519
Segment Assets
Net fixed assets	129,274				119,596				129,274	119,596
Goodwill	35,269				39,639				35,269	39,639
Long Lived Assets	240,006				227,707				240,006	227,707
Capital Expenditures
Capital expenditures									31,983	37,588
U.S. Telecom | Operating segments | Wireless
Revenue
Revenue									148,053	155,390	153,040
U.S. Telecom | Operating segments | Wireline
Revenue
Revenue									26,448	25,241	26,155
U.S. Telecom | Operating segments | Equipment and other
Revenue
Revenue									2,225	2,355	1,196
International Telecom
Segment Assets
Goodwill	24,326				5,438				24,326	5,438
International Telecom | Operating segments
Revenue
Revenue									258,276	151,342	155,506
Depreciation and amortization									40,492	24,883	28,079
Non-cash stock-based compensation									22
Operating income (loss)									35,436	28,200	28,674
Segment Assets
Net fixed assets	372,741				133,262				372,741	133,262
Goodwill	24,326				5,438				24,326	5,438
Long Lived Assets	597,454				278,770				597,454	278,770
Capital Expenditures
Capital expenditures									62,808	22,804
International Telecom | Operating segments | Wireless
Revenue
Revenue									80,745	81,652	88,650
International Telecom | Operating segments | Wireline
Revenue
Revenue									161,571	61,244	59,129
International Telecom | Operating segments | Equipment and other
Revenue
Revenue									15,960	8,447	7,728
Renewable energy
Segment Assets
Goodwill	3,279								3,279
Renewable energy | Operating segments
Revenue
Revenue									22,001	21,040	449
Depreciation and amortization									4,987	4,820	105
Non-cash stock-based compensation									114	267
Operating income (loss)									(246)	6,720	(2,218)
Segment Assets
Net fixed assets	130,268				106,560				130,268	106,560
Goodwill	3,279								3,279
Long Lived Assets	$ 190,253				$ 122,788				190,253	122,788
Capital Expenditures
Capital expenditures									22,615	38
Renewable energy | Operating segments | Equipment and other
Revenue
Revenue									393		$ 449
Renewable energy | Operating segments | Renewable energy
Revenue
Revenue									$ 21,608	$ 21,040

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