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
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]        
GOODWILL (Note 10) $ 0 $ 0 $ 21,798  
Intangible assets subject to amortization (Definite-lived)        
Intangible assets subject to amortization, Gross 24,548 24,548 24,548  
Accumulated Amortization (9,812) (9,812) (7,956)  
Intangible assets subject to amortization, Net 14,736 14,736 16,592  
Intangible assets not subject to amortization (Indefinite-lived)        
Total, Gross 24,548 24,548 26,903  
Total, Net 14,736 14,736 18,947  
Impairment of intangible assets 2,400      
Amortization of intangible assets   1,856 1,861 $ 1,861
Emissions Allowance        
Intangible assets not subject to amortization (Indefinite-lived)        
Intangible assets not subject to amortization, Net 0 0 197  
Trade name        
Intangible assets not subject to amortization (Indefinite-lived)        
Intangible assets not subject to amortization, Net 0 0 2,158  
Customer relationships        
Intangible assets subject to amortization (Definite-lived)        
Intangible assets subject to amortization, Gross 16,852 16,852 16,852  
Accumulated Amortization (5,898) (5,898) (4,775)  
Intangible assets subject to amortization, Net 10,954 10,954 12,077  
Non-compete agreements        
Intangible assets subject to amortization (Definite-lived)        
Intangible assets subject to amortization, Gross 94 94 94  
Accumulated Amortization (94) (94) (80)  
Intangible assets subject to amortization, Net 0 0 14  
Licenses and permits        
Intangible assets subject to amortization (Definite-lived)        
Intangible assets subject to amortization, Gross 1,471 1,471 1,471  
Accumulated Amortization (601) (601) (495)  
Intangible assets subject to amortization, Net 870 870 976  
Developed technology        
Intangible assets subject to amortization (Definite-lived)        
Intangible assets subject to amortization, Gross 6,131 6,131 6,131  
Accumulated Amortization (3,219) (3,219) (2,606)  
Intangible assets subject to amortization, Net $ 2,912 $ 2,912 $ 3,525