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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales |  | $ 1,338,512 |  | $ 1,226,644 | $ 3,929,485 |  | $ 3,340,026
Income from operations |  | 30,455 |  | 56,098 | 156,315 |  | 119,721
Other Operating Income (Expense) [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Impairment loss on sale of NEO assets |  | 10,400 |  |  | 10,400 |  |
Wood Products [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales |  | 179,200 |  | 181,000 | 564,100 |  | 498,100
Building Materials Distribution [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales |  | 1,159,300 |  | 1,045,600 | 3,365,400 |  | 2,842,000
Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Income from operations |  | 37,433 |  | 63,406 | 180,137 |  | 140,663
Operating Segments [Member] | Wood Products [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales |  | 402,672 |  | 366,920 | 1,226,146 |  | 1,042,854
Income from operations |  | 13,929 | [1] | 24,027 | 76,532 | [1] | 46,810
Operating Segments [Member] | Building Materials Distribution [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales |  | 1,159,304 |  | 1,045,646 | 3,365,468 |  | 2,842,035
Income from operations |  | 23,504 |  | 39,379 | 103,605 |  | 93,853
Intersegment Eliminations and Other [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sales | [2] | (223,464) |  | (185,922) | 662,129 |  | (544,863)
Corporate, Non-Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Income from operations |  | $ (6,978) |  | $ (7,308) | $ (23,822) |  | $ (20,942)
[1] | Wood Products segment operating income for the three and nine months ended September 30, 2018, includes an impairment loss of $10.4 million upon classifying certain Wood Products facilities in Northeast Oregon as held for sale. For additional information, see Note 6, Assets Held For Sale.
[2] | Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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- Definition Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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