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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Inventories [Table Text Block]
Inventories included the following (work in process is not material):
 
 December 31,
2020
December 31,
2019
 (thousands)
Finished goods and work in process$431,663 $413,020 
Logs35,622 45,574 
Other raw materials and supplies36,195 39,002 
 $503,480 $497,596 
Property and Equipment [Table Text Block] Property and equipment consisted of the following asset classes with the following general range of estimated useful lives:
 
 December 31,
2020
December 31,
2019
General Range of Estimated Useful Lives in Years
 (thousands)
Land$47,099 $39,304 
Buildings151,718 140,008 20-40
Improvements64,178 61,187 10-15
Mobile equipment, information technology, and office furniture178,271 165,445 3-7
Machinery and equipment687,768 666,467 7-12
Construction in progress40,606 34,846 
 1,169,640 1,107,257 
Less accumulated depreciation(708,184)(630,308)
 $461,456 $476,949