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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Sales by Product Line [Table Text Block] | Wood Products and Building Materials Distribution segment sales to external customers, including related parties, by product line are as follows:
|  | Three Months Ended June 30 |  | Six Months Ended June 30
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (millions)
Wood Products |  |  |  |  |  |  |  |
LVL (a) |  | $ | 9.8 |  |  | $ | 9.3 |  |  | $ | 23.2 |  |  | $ | 25.3 |
I-joists (a) |  | 7.9 |  |  | 7.6 |  |  | 17.8 |  |  | 18.7 |
Other engineered wood products (a) |  | 5.8 |  |  | 5.4 |  |  | 12.3 |  |  | 10.4 |
Plywood and veneer |  | 96.7 |  |  | 79.2 |  |  | 183.7 |  |  | 151.6 |
Lumber |  | 25.0 |  |  | 22.5 |  |  | 49.9 |  |  | 43.5 |
Byproducts (b) |  | 22.8 |  |  | 13.4 |  |  | 44.9 |  |  | 27.3 |
Particleboard |  | 11.8 |  |  | 11.7 |  |  | 22.6 |  |  | 22.5 |
Other |  | 14.7 |  |  | 9.1 |  |  | 30.2 |  |  | 17.7 |
|  | 194.3 |  |  | 158.2 |  |  | 384.8 |  |  | 317.0 |
Building Materials Distribution |  |  |  |  |  |  |  |
Commodity |  | 602.7 |  |  | 453.8 |  |  | 1,093.2 |  |  | 832.8 |
General line |  | 392.9 |  |  | 341.6 |  |  | 708.1 |  |  | 617.4 |
Engineered wood products |  | 218.2 |  |  | 185.3 |  |  | 404.8 |  |  | 346.2 |
|  | 1,213.8 |  |  | 980.7 |  |  | 2,206.1 |  |  | 1,796.4 |
|  | $ | 1,408.1 |  |  | $ | 1,138.9 |  |  | $ | 2,591.0 |  |  | $ | 2,113.4 |
___________________________________
(a) | Amounts represent sales to external customers. Sales are calculated after intersegment sales eliminations to our Building Materials Distribution segment, as well as the cost of EWP rebates and sales allowances provided at various stages of the supply chain (including distributors, retail lumberyards, and professional builders). For six months ended June 30, 2018, approximately 73% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.
(b) | As discussed in Note 3, Revenues, prior period amounts have not been adjusted under the modified retrospective method upon adoption of ASC Topic 606, Revenue from Contracts with Customers.
Segment information [Table Text Block] | An analysis of our operations by segment is as follows:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (thousands)
Net sales by segment |  |  |  |  |  |  |  |
Wood Products | $ | 425,483 |  |  | $ | 350,277 |  |  | $ | 823,474 |  |  | $ | 675,934 |
Building Materials Distribution | 1,213,783 |  |  | 980,706 |  |  | 2,206,164 |  |  | 1,796,389 |
Intersegment eliminations and other (a) | (231,134 | ) |  | (192,044 | ) |  | (438,665 | ) |  | (358,941 | )
Total net sales | $ | 1,408,132 |  |  | $ | 1,138,939 |  |  | $ | 2,590,973 |  |  | $ | 2,113,382 |
Segment operating income |  |  |  |  |  |  |
Wood Products | $ | 36,482 |  |  | $ | 15,395 |  |  | $ | 62,603 |  |  | $ | 22,783 |
Building Materials Distribution | 47,713 |  |  | 34,509 |  |  | 80,101 |  |  | 54,474 |
Total segment operating income | 84,195 |  |  | 49,904 |  |  | 142,704 |  |  | 77,257 |
Unallocated corporate and other | (10,139 | ) |  | (7,405 | ) |  | (16,844 | ) |  | (13,633 | )
Income from operations | $ | 74,056 |  |  | $ | 42,499 |  |  | $ | 125,860 |  |  | $ | 63,624 |
___________________________________
(a) | Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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