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Inventories (Tables) | 3 Months Ended
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Mar. 31, 2021
Inventory Disclosure [Abstract] |
Schedule of Inventory, Current [Table Text Block] | Components of inventories as of March 31, 2021 and December 31, 2020 are as follows:
| March 31, 2021 |  | December 31, 2020
| (In Thousands)
Finished goods | $ | 64,484 |  |  | $ | 68,121 |
Raw materials | 3,288 |  |  | 2,910 |
Parts and supplies | 5,018 |  |  | 4,001 |
Work in progress | 1,670 |  |  | 1,626 |
Total inventories | $ | 74,460 |  |  | $ | 76,658 |

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