DISCONTINUED OPERATIONS (Financial Information for Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on the sale of equipment	$ 0	$ 0	$ 0	$ 322
Net income	$ 0	409	0	1,052
Receivables			(1,482)	5,731
Inventories			(490)	1,270
Accounts payable			(475)	(112)
Other current liabilities			421	365
Net cash provided by operating activities			0	1,399
Proceeds from sale of property and equipment			0	2,223
Payments to Acquire Property, Plant, and Equipment			(8)	(21)
Net cash used in investing activities			$ 0	(313)
Waste Services Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from services and product sales		1,959		5,965
Cost of sales for services		1,423		4,431
Selling, general, and administrative expenses		170		532
Gain on the sale of equipment		43		50
Net income		$ 409		1,052
Net income from discontinued operations				1,052
Depreciation and amortization				330
Net cash provided by operating activities				1,399
Net cash used in investing activities				(313)
Discontinued Operations [Member] | Waste Services Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on the sale of equipment				(50)
Receivables				(85)
Inventories				8
Accounts payable				117
Other current liabilities				27
Proceeds from sale of property and equipment				44
Payments to Acquire Property, Plant, and Equipment				$ (357)