Annual report pursuant to Section 13 and 15(d)

ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES. (Details 2)

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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES. (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 35,652 $ 33,773
Work in progress 8,807 7,092
Raw materials 7,601 6,571
Low-carbon and RIN credits 7,952 10,926
Other 1,538 1,708
Total inventories $ 61,550 $ 60,070