Annual report pursuant to Section 13 and 15(d)

GOODWILL AND INTANGIBLE ASSETS, NET (Details)

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GOODWILL AND INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible assets subject to amortization [Abstract]      
Gross $ 24,548 $ 24,548  
Accumulated Amortization (6,095) (4,234)  
Net 18,453 20,314  
Amortization of intangible assets 1,861 1,880 $ 1,883
Intangible assets not subject to amortization [Abstract]      
Gross 26,903 26,903  
Accumulated Amortization (6,095) (4,234)  
Net 20,808 22,669  
Estimated amortization expense for succeeding five fiscal years [Abstract]      
2018 1,861    
2019 1,855    
2020 1,842    
2021 1,842    
2022 1,822    
Thereafter 9,231    
Total 18,453    
Emissions Allowance [Member]      
Intangible assets not subject to amortization [Abstract]      
Gross 197 197  
Accumulated Amortization 0 0  
Net 197 197  
Trade Name [Member]      
Intangible assets not subject to amortization [Abstract]      
Gross 2,158 2,158  
Accumulated Amortization 0 0  
Net 2,158 2,158  
Customer Relationships [Member]      
Estimated amortization expense for succeeding five fiscal years [Abstract]      
2018 1,123    
2019 1,123    
2020 1,123    
2021 1,123    
2022 1,123    
Thereafter 7,587    
Total 13,202    
Non-compete Agreements [Member]      
Estimated amortization expense for succeeding five fiscal years [Abstract]      
2018 19    
2019 13    
2020 0    
2021 0    
2022 0    
Thereafter 0    
Total 32    
Licenses and Permits [Member]      
Estimated amortization expense for succeeding five fiscal years [Abstract]      
2018 106    
2019 106    
2020 106    
2021 106    
2022 86    
Thereafter 571    
Total 1,081    
Developed Technology [Member]      
Estimated amortization expense for succeeding five fiscal years [Abstract]      
2018 613    
2019 613    
2020 613    
2021 613    
2022 613    
Thereafter 1,073    
Total 4,138    
Customer Relationships [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 16,852 16,852  
Accumulated Amortization (3,651) (2,527)  
Net 13,201 14,325  
Non-compete Agreements [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 94 94  
Accumulated Amortization (61) (43)  
Net 33 51  
Licenses and Permits [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 1,471 1,471  
Accumulated Amortization (390) (285)  
Net 1,081 1,186  
Developed Technology [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 6,131 6,131  
Accumulated Amortization (1,993) (1,379)  
Net $ 4,138 $ 4,752