v3.20.2

Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory Disclosure [Abstract] |  |
Finished goods | $ 17,362 | $ 17,612
Raw materials | 177 | 243
Parts, supplies and other | 29,129 | 30,441
Total inventories | $ 46,668 | $ 48,296

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