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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Inventories [Table Text Block]
Inventories included the following (work in process is not material):
 
 
 
March 31,
2018
 
December 31,
2017
 
 
(thousands)
Finished goods and work in process
 
$
452,917

 
$
377,266

Logs
 
43,195

 
57,229

Other raw materials and supplies
 
42,611

 
42,178

 
 
$
538,723

 
$
476,673
Property and Equipment [Table Text Block]
Property and equipment consisted of the following asset classes:
 
 
 
March 31,
2018
 
December 31,
2017
 
 
(thousands)
Land
 
$
38,606

 
$
38,606

Buildings
 
144,775

 
144,404

Improvements
 
69,777

 
55,267

Mobile equipment, information technology, and office furniture
 
143,417

 
138,245

Machinery and equipment
 
668,839

 
659,708

Construction in progress
 
16,712

 
23,303

 
 
1,082,126

 
1,059,533

Less accumulated depreciation
 
(513,872
)
 
(493,741
)
 
 
$
568,254

 
$
565,792