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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Inventories [Table Text Block] | Inventories included the following (work in process is not material):
|  | September 30, 2021 |  | December 31, 2020
|  | (thousands)
Finished goods and work in process |  | $ | 556,123 |  |  | $ | 431,663 |
Logs |  | 50,344 |  |  | 35,622 |
Other raw materials and supplies |  | 37,903 |  |  | 36,195 |
|  | $ | 644,370 |  |  | $ | 503,480 |
Property and Equipment [Table Text Block] | Property and equipment consisted of the following asset classes:
|  | September 30, 2021 |  | December 31, 2020
|  | (thousands)
Land |  | $ | 47,099 |  |  | $ | 47,099 |
Buildings |  | 154,984 |  |  | 151,718 |
Improvements |  | 65,570 |  |  | 64,178 |
Mobile equipment, information technology, and office furniture |  | 185,053 |  |  | 178,271 |
Machinery and equipment |  | 721,713 |  |  | 687,768 |
Construction in progress |  | 35,334 |  |  | 40,606 |
|  | 1,209,753 |  |  | 1,169,640 |
Less accumulated depreciation |  | (750,499) |  |  | (708,184) |
|  | $ | 459,254 |  |  | $ | 461,456 |

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