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INVENTORIES. (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 42,279 $ 35,652
Work in progress 8,115 8,807
Raw materials 7,834 7,601
Low-carbon and RIN credits 7,461 7,952
Other 1,616 1,538
Total $ 67,305 $ 61,550 [1]
[1] Amounts derived from the audited financial statements for the year ended December 31, 2017