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Summary of Significant Accounting Policies (Tables)
9 Months Ended
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 
Buildings154,984 151,718 
Improvements65,570 64,178 
Mobile equipment, information technology, and office furniture185,053 178,271 
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