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Inventories Inventories (Tables) | 12 Months Ended
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Dec. 31, 2019
Inventory [Line Items] |
Schedule of Inventory, Current [Table Text Block] | Components of inventories, net of reserve, are as follows:
|  | December 31,
|  | 2019 |  | 2018
|  | (In Thousands)
Finished goods |  | $ | 70,135 |  |  | $ | 69,762 |
Raw materials |  | 4,125 |  |  | 3,503 |
Parts and supplies |  | 47,793 |  |  | 47,386 |
Work in progress |  | 14,457 |  |  | 22,920 |
Total inventories |  | $ | 136,510 |  |  | $ | 143,571 |

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