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Revenue from Contract with Customer (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Retained Earnings | $ 652,124 |  | $ 676,644 | $ 675,151
ASC 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Retained Earnings |  | $ 800 |  |
ASC 606 | Wood construction products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net sales | 86.00% |  |  |
ASC 606 | Concrete construction products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net sales | 14.00% |  |  |
ASC 606 | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net sales | 1.00% |  |  |

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