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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) segment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 segment
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of Reportable Segments | segment |  |  |  | 2 |  |  | 3
Net Sales | $ 1,138,939 | $ 1,043,773 |  | $ 2,113,382 | $ 1,924,468 |  |
Income from operations | 42,449 | 37,867 |  | 63,543 | 51,272 |  |
Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Income from operations | 49,904 | 45,426 |  | 77,257 | 64,684 |  |
Operating Segments [Member] | Wood Products [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net Sales | 350,277 | 346,358 |  | 675,934 | 649,815 |  |
Income from operations | 15,395 | 16,309 |  | 22,783 | 22,194 |  |
Operating Segments [Member] | Building Materials Distribution [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net Sales | 980,706 | 850,042 |  | 1,796,389 | 1,567,296 |  |
Income from operations | 34,509 | 29,117 |  | 54,474 | 42,490 |  |
Intersegment Eliminations and Other [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net Sales | (192,044) | (152,627) | [1] | (358,941) | (292,643) | [1] |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Income from operations | $ (7,455) | $ (7,559) |  | $ (13,714) | $ (13,412) |  |
[1] | Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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