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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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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 |
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(a) | Capital lease assets are included in the 'Buildings' asset class.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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