v3.5.0.2
East Dubuque Merger - Summary Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition, Pro Forma Information [Abstract]        
Net income (loss) per common unit, basic (in dollars per unit) $ (0.02) $ 0.46    
East Dubuque Merger        
Business Acquisition, Pro Forma Information [Abstract]        
Net sales $ 119,797 $ 152,875 $ 227,737 $ 282,677
Net income (loss) $ (2,747) $ 52,610 $ 12,182 $ 81,102
Net income (loss) per common unit, basic (in dollars per unit)     $ 0.11 $ 0.72
Net income (loss) per common unit, diluted (in dollars per unit) $ (0.02) $ 0.46 $ 0.11 $ 0.72