v3.19.1

BUSINESS SEGMENTS (Information by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lower of cost or NRV |  | $ 930 | $ 0 | $ 76 | $ 705 | $ 1,571 | $ 666 | $ 317 | $ 3,825 | $ 1,711 |  | $ 6,379 |  | $ 20,374 |
Costs associated with abnormal production and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,707 |
Gross Margin (Deficit) |  | 14,826 | 8,959 | 7,286 | 7,200 | 3,628 | 6,062 | 4,803 | (2,605) | 38,271 |  | 11,888 |  | (26,797) |
Depreciation, depletion and amortization expense | [1] |  |  |  |  |  |  |  |  | 32,215 |  | 33,209 |  | 40,913 |
Operating Segments [Member] | Potash [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lower of cost or NRV |  |  |  |  |  |  |  |  |  | 0 |  | 550 |  | 18,379 |
Costs associated with abnormal production and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 650 |
Gross Margin (Deficit) |  |  |  |  |  |  |  |  |  | 29,008 |  | 15,670 |  | (25,398) |
Depreciation, depletion and amortization expense | [1] |  |  |  |  |  |  |  |  | 25,134 |  | 26,485 |  | 30,708 |
Operating Segments [Member] | Trio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lower of cost or NRV |  |  |  |  |  |  |  |  |  | 1,711 |  | 5,829 |  | 1,995 |
Costs associated with abnormal production and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,057 |
Gross Margin (Deficit) |  |  |  |  |  |  |  |  |  | (3,782) |  | (9,548) |  | (1,399) |
Depreciation, depletion and amortization expense | [1] |  |  |  |  |  |  |  |  | 6,343 |  | 6,576 |  | 9,296 |
Operating Segments [Member] | Oil Field Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lower of cost or NRV |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Costs associated with abnormal production and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Gross Margin (Deficit) |  |  |  |  |  |  |  |  |  | 13,045 |  | 5,766 |  | 0 |
Depreciation, depletion and amortization expense | [1] |  |  |  |  |  |  |  |  | 343 |  | 19 |  | 0 |
Corporate/Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization expense | [1] |  |  |  |  |  |  |  |  | 395 |  | 129 |  | 909 |
Freight costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 37,052 |  | 32,016 |  | 36,062 |
Freight costs [Member] | Operating Segments [Member] | Potash [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 17,682 |  | 13,912 |  | 25,732 |
Freight costs [Member] | Operating Segments [Member] | Trio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 19,370 |  | 18,104 |  | 10,330 |
Freight costs [Member] | Operating Segments [Member] | Oil Field Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Warehouse and handling costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 9,281 |  | 9,670 |  | 11,006 |
Warehouse and handling costs [Member] | Operating Segments [Member] | Potash [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 5,046 |  | 5,556 |  | 8,438 |
Warehouse and handling costs [Member] | Operating Segments [Member] | Trio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 4,225 |  | 4,114 |  | 2,568 |
Warehouse and handling costs [Member] | Operating Segments [Member] | Oil Field Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 10 |  | 0 |  | 0 |
Warehouse and handling costs [Member] | Corporate/Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mineral [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | 54,364 | 41,410 | 55,176 | 57,320 | 42,582 | 36,484 | 47,347 | 51,502 | 208,270 | [2] | 177,915 | [2] | 212,097 | [2]
Cost of goods and services sold |  | $ 26,504 | $ 23,370 | $ 35,426 | $ 36,655 | $ 26,481 | $ 21,414 | $ 31,735 | $ 38,332 | 121,955 |  | 117,962 |  | 169,745 |
Mineral [Member] | Operating Segments [Member] | Potash [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [2] |  |  |  |  |  |  |  |  | 124,058 |  | 107,917 |  | 159,207 |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 72,322 |  | 72,229 |  | 131,406 |
Mineral [Member] | Operating Segments [Member] | Trio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [2] |  |  |  |  |  |  |  |  | 66,808 |  | 63,686 |  | 52,890 |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | 45,284 |  | 45,187 |  | 38,339 |
Mineral [Member] | Operating Segments [Member] | Oil Field Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [2] |  |  |  |  |  |  |  |  | 17,404 |  | 6,312 |  | 0 |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  | $ 4,349 |  | $ 546 |  | $ 0 |
[1] | Depreciation and depletion incurred for potash and Trio® excludes depreciation and depletion absorbed in or (relieved from) inventory.
[2] | 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®.

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