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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
SEGMENT REPORTING (Details) $ in Thousands	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($) segment	Dec. 31, 2015 USD ($)
Segment reporting
Number of reportable segments \| segment		5
Revenue
Revenue	$ 89,686	$ 85,344
Depreciation and amortization	14,554	14,751
Non-cash stock-based compensation	1,728	1,224
Operating income (loss)	15,893	19,151
Segment Assets
Net fixed assets	375,295		$ 373,503
Goodwill	45,077		45,077
Total assets	958,013		945,004
Capital Expenditures
Capital expenditures	16,445	13,812
U.S. Wireless
Revenue
Revenue	58,878	57,015
International wireless
Revenue
Revenue	22,445	20,593
Wireline
Revenue
Revenue		20,593
Equipment and other
Revenue
Revenue	2,774	2,447
Renewable energy
Revenue
Revenue	5,589	5,289
Reconciling Items
Revenue
Depreciation and amortization	1,352	1,133
Non-cash stock-based compensation	1,700	1,043
Operating income (loss)	(8,653)	(6,455)
Segment Assets
Net fixed assets	12,741		14,085
Total assets	305,591		315,739
Capital Expenditures
Capital expenditures	1,110	732
U.S. Telecom
Revenue
Revenue	46,198	42,376
Depreciation and amortization	5,654	5,503
Operating income (loss)	16,746	16,775
Segment Assets
Net fixed assets	118,857		119,596
Goodwill	39,639		39,639
Total assets	243,156		227,707
Capital Expenditures
Capital expenditures	7,561	7,871
U.S. Telecom \| U.S. Wireless
Revenue
Revenue	39,464	35,843
U.S. Telecom \| International wireless
Revenue
Revenue	6,046
U.S. Telecom \| Wireline
Revenue
Revenue		5,993
U.S. Telecom \| Equipment and other
Revenue
Revenue	688	540
International Telecom
Revenue
Revenue	37,899	37,679
Depreciation and amortization	6,341	6,911
Operating income (loss)	7,737	6,179
Segment Assets
Net fixed assets	138,348		133,262
Goodwill	5,438		5,438
Total assets	285,491		278,770
Capital Expenditures
Capital expenditures	7,774	5,209
International Telecom \| U.S. Wireless
Revenue
Revenue	19,414	21,172
International Telecom \| International wireless
Revenue
Revenue	16,399
International Telecom \| Wireline
Revenue
Revenue		14,600
International Telecom \| Equipment and other
Revenue
Revenue	2,086	1,907
Renewable energy
Revenue
Revenue	5,589	5,289
Depreciation and amortization	1,207	1,204
Non-cash stock-based compensation	28	181
Operating income (loss)	63	2,652
Segment Assets
Net fixed assets	105,349		106,560
Total assets	123,775		$ 122,788
Renewable energy \| Renewable energy
Revenue
Revenue	$ 5,589	$ 5,289