Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS, NET (Details)

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GOODWILL AND INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Intangible assets subject to amortization [Abstract]      
Gross $ 24,548   $ 24,548
Accumulated Amortization (6,560)   (6,095)
Net 17,988   18,453
Amortization of intangible assets 465 $ 465  
Intangible assets not subject to amortization [Abstract]      
Gross 26,903   26,903
Accumulated Amortization (6,560)   (6,095)
Net 20,343   20,808
Estimated amortization expense for succeeding five fiscal years [Abstract]      
Total 17,988    
Remainder of 2018 1,396    
2019 1,856    
2020 1,842    
2021 1,837    
2022 1,822    
2023 1,822    
Thereafter 7,413    
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]      
Total 12,920    
Remainder of 2018 843    
2019 1,123    
2020 1,123    
2021 1,123    
2022 1,123    
2023 1,123    
Thereafter 6,462    
Non-compete Agreements [Member]      
Estimated amortization expense for succeeding five fiscal years [Abstract]      
Total 28    
Remainder of 2018 14    
2019 14    
2020 0    
2021 0    
2022 0    
2023 0    
Thereafter 0    
Licenses and Permits [Member]      
Estimated amortization expense for succeeding five fiscal years [Abstract]      
Total 1,055    
Remainder of 2018 79    
2019 106    
2020 106    
2021 101    
2022 86    
2023 86    
Thereafter 491    
Developed Technology [Member]      
Estimated amortization expense for succeeding five fiscal years [Abstract]      
Total 3,985    
Remainder of 2018 460    
2019 613    
2020 613    
2021 613    
2022 613    
2023 613    
Thereafter 460    
Customer Relationships [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 16,852   16,852
Accumulated Amortization (3,932)   (3,651)
Net 12,920   13,201
Non-compete Agreements [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 94   94
Accumulated Amortization (66)   (61)
Net 28   33
Licenses and Permits [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 1,471   1,471
Accumulated Amortization (416)   (390)
Net 1,055   1,081
Developed Technology [Member]      
Intangible assets subject to amortization [Abstract]      
Gross 6,131   6,131
Accumulated Amortization (2,146)   (1,993)
Net $ 3,985   $ 4,138