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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Sales |  | $ 1,589,313 | $ 1,269,524 | $ 4,002,607 | $ 3,541,691
Income from operations |  | 158,572 | 44,898 | 235,889 | 111,684
Curtailment of I-joist Production at Roxboro, NC Facility |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Accelerated depreciation |  |  |  | 15,000 |
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from operations |  | 173,936 | 54,262 | 267,285 | 136,117
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | [1] | (212,044) | (201,199) | (584,573) | (587,940)
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income from operations |  | (15,364) | (9,364) | (31,396) | (24,433)
Wood Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales |  | 151,600 | 123,900 | 380,700 | 391,000
Wood Products [Member] | Curtailment of I-joist Production at Roxboro, NC Facility |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Accelerated depreciation |  |  |  | 15,000 |
Other closure-related costs |  |  |  | 1,700 |
Wood Products [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales |  | 363,674 | 325,102 | 965,240 | 978,881
Income from operations | [2] | 66,035 | 15,597 | 86,872 | 46,135
Building Materials Distribution [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales |  | 1,437,700 | 1,145,600 | 3,621,900 | 3,150,700
Building Materials Distribution [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales |  | 1,437,683 | 1,145,621 | 3,621,940 | 3,150,750
Income from operations |  | $ 107,901 | $ 38,665 | $ 180,413 | $ 89,982
[1] | Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.
[2] | Wood Products segment operating income for the nine months ended September 30, 2020, includes $15.0 million of accelerated depreciation and $1.7 million of other closure-related costs due to the permanent curtailment of I-joist production at our Roxboro, North Carolina facility. For more information, see Note 5, Curtailment of Manufacturing Facility.

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