Annual report pursuant to Section 13 and 15(d)

GOODWILL AND INTANGIBLE ASSETS, NET - Intangible Assets (Details)

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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible assets subject to amortization (Definite-lived)      
Intangible assets subject to amortization, Gross $ 24,548 $ 24,548  
Accumulated Amortization (7,956) (6,095)  
Intangible assets subject to amortization, Net 16,592 18,453  
Intangible assets not subject to amortization (Indefinite-lived)      
Total, Gross 26,903 26,903  
Total, Net 18,947 20,808  
Amortization of intangible assets 1,861 1,861 $ 1,880
Emissions Allowance      
Intangible assets not subject to amortization (Indefinite-lived)      
Intangible assets not subject to amortization, Net 197 197  
Trade name      
Intangible assets not subject to amortization (Indefinite-lived)      
Intangible assets not subject to amortization, Net 2,158 2,158  
Customer relationships      
Intangible assets subject to amortization (Definite-lived)      
Intangible assets subject to amortization, Gross 16,852 16,852  
Accumulated Amortization (4,775) (3,651)  
Intangible assets subject to amortization, Net 12,077 13,201  
Non-compete agreements      
Intangible assets subject to amortization (Definite-lived)      
Intangible assets subject to amortization, Gross 94 94  
Accumulated Amortization (80) (61)  
Intangible assets subject to amortization, Net 14 33  
Licenses and permits      
Intangible assets subject to amortization (Definite-lived)      
Intangible assets subject to amortization, Gross 1,471 1,471  
Accumulated Amortization (495) (390)  
Intangible assets subject to amortization, Net 976 1,081  
Developed technology      
Intangible assets subject to amortization (Definite-lived)      
Intangible assets subject to amortization, Gross 6,131 6,131  
Accumulated Amortization (2,606) (1,993)  
Intangible assets subject to amortization, Net $ 3,525 $ 4,138