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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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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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