CHANGE IN ACCOUNTING STANDARDS - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue
Corn Revenue	$ 12,081	$ 10,956	$ 42,425	$ 38,675
Method A
Revenue
Total	1,400	2,200	12,200	11,300
Method B
Revenue
Total	$ 10,700	$ 8,800	$ 30,200	$ 27,400