Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS, NET - Finite and Indefinite-Lived Intangible Assets (Details)

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GOODWILL AND INTANGIBLE ASSETS, NET - Finite and Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Intangible assets subject to amortization (Definite-lived)          
Gross $ 24,548   $ 24,548   $ 24,548
Accumulated Amortization (7,026)   (7,026)   (6,095)
Total 17,522   17,522   18,453
Intangible assets not subject to amortization [Abstract]          
Gross intangible assets 26,903   26,903   26,903
Net intangible assets 19,877   19,877   20,808
Amortization of intangible assets 465 $ 466 931 $ 931  
Emissions Allowance [Member]          
Intangible assets not subject to amortization [Abstract]          
Intangible assets not subject to amortization (Indefinite-lived) 197   197   197
Trade Name [Member]          
Intangible assets not subject to amortization [Abstract]          
Intangible assets not subject to amortization (Indefinite-lived) 2,158   2,158   2,158
Customer Relationships [Member]          
Intangible assets subject to amortization (Definite-lived)          
Gross 16,852   16,852   16,852
Accumulated Amortization (4,213)   (4,213)   (3,651)
Total 12,639   12,639   13,201
Non-compete Agreements [Member]          
Intangible assets subject to amortization (Definite-lived)          
Gross 94   94   94
Accumulated Amortization (71)   (71)   (61)
Total 23   23   33
Licenses and Permits [Member]          
Intangible assets subject to amortization (Definite-lived)          
Gross 1,471   1,471   1,471
Accumulated Amortization (443)   (443)   (390)
Total 1,028   1,028   1,081
Developed Technology [Member]          
Intangible assets subject to amortization (Definite-lived)          
Gross 6,131   6,131   6,131
Accumulated Amortization (2,299)   (2,299)   (1,993)
Total $ 3,832   $ 3,832   $ 4,138