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Segment Information | 9 Months Ended
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Sep. 30, 2017
Segment Reporting [Abstract] |
Segment Information | Segment Information As of January 1, 2017, we operate our business using two reportable segments: Wood Products and Building Materials Distribution. Prior to January 1, 2017, we operated our business using three reportable segments: Wood Products, Building Materials Distribution, and Corporate and Other. This change is based on Corporate and Other no longer earning revenue as of January 1, 2017 and thus no longer meeting the definition of a reportable segment. Corporate and Other results are now presented as reconciling items to arrive at total net sales and operating income. Corresponding information for the three and nine months ended September 30, 2016 has been revised to conform with current presentation. There are no other differences in our basis of measurement of segment profit or loss from those disclosed in Note 14, Segment Information, of the Notes to Consolidated Financial Statements in "Item 8. Financial Statements and Supplementary Data" in our 2016 Form 10-K. An analysis of our operations by segment is as follows:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (thousands)
Net sales by segment |  |  |  |  |  |  |  |
Wood Products | $ | 366,920 |  |  | $ | 340,928 |  |  | $ | 1,042,854 |  |  | $ | 990,743 |
Building Materials Distribution | 1,045,646 |  |  | 889,026 |  |  | 2,842,035 |  |  | 2,456,322 |
Intersegment eliminations and other (a) | (185,922 | ) |  | (162,740 | ) |  | (544,863 | ) |  | (455,383 | )
Total net sales | $ | 1,226,644 |  |  | $ | 1,067,214 |  |  | $ | 3,340,026 |  |  | $ | 2,991,682 |
Segment operating income |  |  |  |  |  |  |
Wood Products | $ | 24,027 |  |  | $ | 11,564 |  |  | $ | 46,810 |  |  | $ | 33,758 |
Building Materials Distribution | 39,379 |  |  | 26,415 |  |  | 93,853 |  |  | 68,905 |
Total segment operating income | 63,406 |  |  | 37,979 |  |  | 140,663 |  |  | 102,663 |
Unallocated corporate and other | (7,398 | ) |  | (6,672 | ) |  | (21,112 | ) |  | (20,084 | )
Income from operations | $ | 56,008 |  |  | $ | 31,307 |  |  | $ | 119,551 |  |  | $ | 82,579 |
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(a) | Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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