Revenue - Revenue Disaggregated by Product (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| Disaggregation of Revenue [Line Items] | ||||
| Net sales | $ 88,582 | $ 79,909 | $ 318,115 | $ 252,965 |
| Net sales, exclusive of freight and other | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Net sales | 77,655 | 69,059 | 288,243 | 223,033 |
| Ammonia | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Net sales | 11,110 | 11,391 | 74,416 | 51,361 |
| UAN | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Net sales | 61,970 | 52,681 | 199,576 | 156,838 |
| Urea products | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Net sales | 4,575 | 4,987 | 14,251 | 14,834 |
| Freight revenue | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Net sales | 8,752 | 8,805 | 23,909 | 23,908 |
| Other revenue | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Net sales | $ 2,175 | $ 2,045 | $ 5,963 | $ 6,024 |