| Schedule of Segment Reporting Information, by Segment |
| | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, 2018 | | Potash | | Trio® | | Oilfield Solutions | | Other | | Consolidated | Sales1 | | $ | 124,058 |
| | $ | 66,808 |
| | $ | 17,404 |
| | $ | — |
| | $ | 208,270 |
| Less: Freight costs | | 17,682 |
| | 19,370 |
| | — |
| | — |
| | 37,052 |
| Warehousing and handling costs | | 5,046 |
| | 4,225 |
| | 10 |
| | — |
| | 9,281 |
| Cost of goods sold | | 72,322 |
| | 45,284 |
| | 4,349 |
| | — |
| | 121,955 |
| Lower of cost or NRV inventory adjustments | | — |
| | 1,711 |
| | — |
| | — |
| | 1,711 |
| Gross Margin (Deficit) | | $ | 29,008 |
| | $ | (3,782 | ) | | $ | 13,045 |
| | $ | — |
| | $ | 38,271 |
| Depreciation and depletion2 | | $ | 25,134 |
| | $ | 6,343 |
| | $ | 343 |
| | $ | 395 |
| | $ | 32,215 |
| | | | | | | | | | | | Year Ended December 31, 2017 | | Potash | | Trio® | | Oilfield Solutions | | Other | | Consolidated | Sales1 | | $ | 107,917 |
| | $ | 63,686 |
| | $ | 6,312 |
| | $ | — |
| | $ | 177,915 |
| Less: Freight costs | | 13,912 |
| | 18,104 |
| | — |
| | — |
| | 32,016 |
| Warehousing and handling costs | | 5,556 |
| | 4,114 |
| | — |
| | — |
| | 9,670 |
| Cost of goods sold | | 72,229 |
| | 45,187 |
| | 546 |
| | — |
| | 117,962 |
| Lower of cost or NRV inventory adjustments | | 550 |
| | 5,829 |
| | — |
| | — |
| | 6,379 |
| Gross Margin (Deficit) | | $ | 15,670 |
| | $ | (9,548 | ) | | $ | 5,766 |
| | $ | — |
| | $ | 11,888 |
| Depreciation, depletion and accretion incurred2 | | $ | 26,485 |
| | $ | 6,576 |
| | $ | 19 |
| | $ | 129 |
| | $ | 33,209 |
| | | | | | | | | | | | Year Ended December 31, 2016 | | Potash | | Trio® | | Oilfield Solutions | | Other | | Consolidated | Sales1 | | $ | 159,207 |
| | $ | 52,890 |
| | $ | — |
| | $ | — |
| | $ | 212,097 |
| Less: Freight costs | | 25,732 |
| | 10,330 |
| | — |
| | — |
| | 36,062 |
| Warehousing and handling costs | | 8,438 |
| | 2,568 |
| | — |
| | — |
| | 11,006 |
| Cost of goods sold | | 131,406 |
| | 38,339 |
| | — |
| | — |
| | 169,745 |
| Lower of cost or NRV inventory adjustments | | 18,379 |
| | 1,995 |
| | — |
| | — |
| | 20,374 |
| Costs associated with abnormal production and other | | 650 |
| | 1,057 |
| | — |
| | — |
| | 1,707 |
| Gross (Deficit) Margin | | $ | (25,398 | ) | | $ | (1,399 | ) | | $ | — |
| | $ | — |
| | $ | (26,797 | ) | Depreciation, depletion and accretion incurred2 | | $ | 30,708 |
| | $ | 9,296 |
| | $ | — |
| | $ | 909 |
| | $ | 40,913 |
|
1 Segment sales include the sales of byproducts generated during the production of potash and Trio®. Prior to the adoption of ASC 606, sales of byproducts were accounted for as a credit to cost of goods sold for potash and Trio®. 2 Depreciation and depletion incurred for potash and Trio® excludes depreciation and depletion absorbed in or (relieved from) inventory. |