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Inventories (Tables) | 3 Months Ended
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Mar. 31, 2019
Inventory Disclosure [Abstract] |
Schedule of Inventory, Current [Table Text Block] | Components of inventories as of March 31, 2019 and December 31, 2018 are as follows:
| March 31, 2019 |  | December 31, 2018
| (In Thousands)
Finished goods | $ | 72,831 |  |  | $ | 69,762 |
Raw materials | 3,279 |  |  | 3,503 |
Parts and supplies | 44,915 |  |  | 47,386 |
Work in progress | 35,603 |  |  | 22,920 |
Total inventories | $ | 156,628 |  |  | $ | 143,571 |

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