v3.19.1

INVENTORY AND LONG-TERM PARTS INVENTORY (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
Summary of Inventory | The following summarizes our inventory, recorded at the lower of weighted average cost or estimated net realizable value as of December 31, 2018, and 2017, respectively (in thousands):
|  | December 31,
|  | 2018 |  | 2017
Finished goods product inventory |  | $ | 48,370 |  |  | $ | 54,577 |
In-process mineral inventory |  | 24,325 |  |  | 19,822 |
Total product inventory |  | 72,695 |  |  | 74,399 |
Current parts inventory, net |  | 9,351 |  |  | 8,727 |
Total current inventory, net |  | 82,046 |  |  | 83,126 |
Long-term parts inventory, net |  | 30,031 |  |  | 30,611 |
Total inventory, net |  | $ | 112,077 |  |  | $ | 113,737 |

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