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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Inventories [Table Text Block]
Inventories included the following (work in process is not material):
 
 
 
June 30,
2018
 
December 31,
2017
 
 
(thousands)
Finished goods and work in process
 
$
490,354

 
$
377,266

Logs
 
39,424

 
57,229

Other raw materials and supplies
 
42,828

 
42,178

 
 
$
572,606

 
$
476,673
Property and Equipment [Table Text Block]
Property and equipment consisted of the following asset classes:
 
 
 
June 30,
2018
 
December 31,
2017
 
 
(thousands)
Land
 
$
40,205

 
$
38,606

Buildings (a)
 
160,785

 
144,404

Improvements
 
55,936

 
55,267

Mobile equipment, information technology, and office furniture
 
145,585

 
138,245

Machinery and equipment
 
670,850

 
659,708

Construction in progress
 
21,427

 
23,303

 
 
1,094,788

 
1,059,533

Less accumulated depreciation
 
(532,763
)
 
(493,741
)
 
 
$
562,025

 
$
565,792


___________________________________ 
 
(a)
Capital lease assets are included in the 'Buildings' asset class.