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BUSINESS COMBINATIONS, AMERICAN NATURAL GAS Acquisition (Details) - USD ($)
$ in Thousands
Aug. 01, 2014
Jun. 30, 2015
Dec. 31, 2014
Business Combination, purchase price allocation [Abstract]      
Excess of fair value of net assets over purchase price   $ 29,649 $ 27,990
American Natural Gas [Member]      
Business Acquisition [Line Items]      
Business acquisition cost $ 15,500    
Percentage of ownership interest acquired (in hundredths) 51.00%    
Minority interest percentage by noncontrolling interest (in hundredths) 49.00%    
Fair value of noncontrolling interest $ 2,200    
Business Combination, purchase price allocation [Abstract]      
Cash and cash equivalents 15,704    
Accounts receivable 306    
Prepaid expenses and other current assets 31    
Inventories 27    
Property and equipment, net 1,921    
Goodwill 10,826    
Other assets 2    
Total assets acquired 26,991    
Accounts payable 49    
Accrued payroll and employee benefits 5    
Accrued expenses and other current liabilities 26    
Billings in excess of costs and recognized earnings on uncompleted contracts 114    
Current portion of long-term debt 34    
Long-term debt 870    
Deferred tax liability 3,530    
Total liabilities assumed 4,628    
Enterprise value 22,363    
Less purchase price 15,500    
Less fair value of noncontrolling interest 2,189    
Excess of fair value of net assets over purchase price 4,674    
American Natural Gas [Member] | Series A Convertible Preferred Stock [Member]      
Business Acquisition [Line Items]      
Business acquisition cost $ 15,500    
Number of shares acquired (in shares) 15,500    
Business Combination, purchase price allocation [Abstract]      
Less purchase price $ 15,500    
American Natural Gas [Member] | Common Stock [Member]      
Business Acquisition [Line Items]      
Preferred stock converted into number of common stock (in shares) 1,033,333    
Noncontrolling interest represent to number of common stock (in shares) 1,000,000    
American Natural Gas [Member] | Trade Names [Member]      
Business Combination, purchase price allocation [Abstract]      
Intangibles $ 6,300    
Estimated useful life 10 years    
Percentage of revenue generated from intangible assets (in hundredths) 4.00%    
American Natural Gas [Member] | Customer Contracts [Member]      
Business Combination, purchase price allocation [Abstract]      
Intangibles $ 2,700    
Estimated useful life 10 years