General form of registration statement for all companies including face-amount certificate companies

ORGANIZATION AND BASIS OF PRESENTATION. (Details 2)

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ORGANIZATION AND BASIS OF PRESENTATION. (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Finished goods $ 41,034 $ 35,778 $ 35,652
Work in progress 8,207 6,855 8,807
Raw materials 7,236 7,233 7,601
Low-carbon and RIN credits 4,150 6,130 7,952
Other 1,882 1,824 1,538
Total inventories $ 62,509 $ 57,820 [1] $ 61,550
[1] Amounts derived from the audited consolidated financial statements for the year ended December 31, 2018.