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East Dubuque Merger - Summary Pro Forma Financial Information (Details) - East Dubuque Merger - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition, Pro Forma Information [Abstract]        
Net sales $ 78,473 $ 96,129 $ 306,210 $ 378,806
Net income (loss) $ (12,257) $ (10,404) $ (75) $ 70,698
Net income (loss) per common unit, basic (in dollars per unit) $ (0.11) $ (0.09) $ 0.00 $ 0.62
Net income (loss) per common unit, diluted (in dollars per unit) $ (0.11) $ (0.09) $ 0.00 $ 0.62