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Segment Sales to External Customers by Product Line (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | [1] | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | [2] | Sep. 30, 2016 USD ($) | [3] | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) segment
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments | segment |  |  |  |  |  |  |  |  | 2 | 3 | 3
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers | $ 1,092,000 | $ 1,226,600 | $ 1,138,900 | $ 974,400 | $ 919,500 | $ 1,067,200 | $ 1,043,800 | $ 880,700 | $ 4,431,991 | $ 3,911,215 | $ 3,633,415
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 94,000 | 71,000 | 85,000
Wood Products and Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | $ 4,432,000 | 3,910,800 | 3,633,400
Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment sales as a percentage to total sales (as a percent) |  |  |  |  |  |  |  |  | 52.00% |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | $ 658,300 | 683,600 | 742,300
Wood Products [Member] | Engineered wood products [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 102,700 | 154,400 | 127,200
Wood Products [Member] | Plywood and veneer [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 324,400 | 316,800 | 385,500
Wood Products [Member] | Lumber [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 87,600 | 87,200 | 96,500
Wood Products [Member] | Byproducts [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 53,200 | 56,000 | 62,000
Wood Products [Member] | Particleboard [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 46,000 | 49,300 | 51,600
Wood Products [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 44,400 | 19,900 | 19,500
Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 3,773,700 | 3,227,200 | 2,891,100
Building Materials Distribution [Member] | Commodity [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 1,808,200 | 1,503,000 | 1,343,400
Building Materials Distribution [Member] | General line [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 1,269,500 | 1,141,900 | 1,037,800
Building Materials Distribution [Member] | Engineered wood products [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | $ 696,000 | $ 582,300 | $ 509,900
[1] | Fourth quarter 2017 results include an $8.1 million, or $0.21 per share, income tax benefit associated with the effects of the Tax Cuts and Jobs Act discussed further in Note 3, Income Taxes.
[2] | The following items impacted fourth quarter 2016 results:•$8.5 million, or $0.22 per share, income tax benefit primarily associated with the reversal of a valuation allowance on foreign deferred tax assets, net of other tax adjustments. For more information, see Note 3, Income Taxes.•$3.0 million, $0.08 per share, after-tax loss on the extinguishment of debt, as we refinanced our senior notes. For more information, see Note 7, Debt.•$2.4 million, or $0.06 per share, after-tax settlement expense associated with voluntary lump-sum payments to pension plan participants. For more information, see Note 9, Retirement and Benefit Plans.
[3] | Third quarter 2016 results include a $5.9 million, or $0.15 per share, after-tax loss on the extinguishment of debt, as we refinanced our senior notes. For more information, see Note 7, Debt.

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