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Segment sales to external customers by product line (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers | $ 919,500 | $ 1,067,200 | $ 1,043,800 | $ 880,700 | $ 876,500 | $ 991,600 | $ 955,400 | $ 809,900 | $ 3,911,215 | $ 3,633,415 | $ 3,573,732
Foreign unaffiliated customers [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 71,000 | 85,000 | 76,000
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | (596,800) | (540,000) | (529,900)
Wood Products and Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 3,910,800 | 3,633,400 | 3,573,700
Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 683,600 | 742,300 | 787,200
Wood Products [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | $ (596,800) | (539,800) | (529,800)
Wood Products [Member] | Intersegment Eliminations [Member] | Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment sales as a percentage to total sales (as a percent) |  |  |  |  |  |  |  |  | 47.00% |  |
Wood Products [Member] | Engineered wood products [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | $ 154,400 | 127,200 | 125,900
Wood Products [Member] | Plywood and veneer [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 316,800 | 385,500 | 413,600
Wood Products [Member] | Lumber [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 87,200 | 96,500 | 113,700
Wood Products [Member] | Byproducts [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 56,000 | 62,000 | 56,100
Wood Products [Member] | Particleboard [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 49,300 | 51,600 | 52,300
Wood Products [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 19,900 | 19,500 | 25,700
Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 3,227,200 | 2,891,100 | 2,786,500
Building Materials Distribution [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 0 | (200) | (100)
Building Materials Distribution [Member] | Commodity [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 1,503,000 | 1,343,400 | 1,376,100
Building Materials Distribution [Member] | General line [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | 1,141,900 | 1,037,800 | 937,300
Building Materials Distribution [Member] | Engineered wood products [Member] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customers |  |  |  |  |  |  |  |  | $ 582,300 | $ 509,900 | $ 473,100

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