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 |