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Segment Information (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Segment Reporting Information [Line Items]

Sales

$ 1,338,512

$ 1,226,644

$ 3,929,485

$ 3,340,026

Income from operations

30,455

56,098

156,315

119,721

Other Operating Income (Expense) [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member]

Segment Reporting Information [Line Items]

Impairment loss on sale of NEO assets

10,400

10,400

Wood Products [Member]

Segment Reporting Information [Line Items]

Sales

179,200

181,000

564,100

498,100

Building Materials Distribution [Member]

Segment Reporting Information [Line Items]

Sales

1,159,300

1,045,600

3,365,400

2,842,000

Operating Segments [Member]

Segment Reporting Information [Line Items]

Income from operations

37,433

63,406

180,137

140,663

Operating Segments [Member] | Wood Products [Member]

Segment Reporting Information [Line Items]

Sales

402,672

366,920

1,226,146

1,042,854

Income from operations

13,929

^[1]

24,027

76,532

^[1]

46,810

Operating Segments [Member] | Building Materials Distribution [Member]

Segment Reporting Information [Line Items]

Sales

1,159,304

1,045,646

3,365,468

2,842,035

Income from operations

23,504

39,379

103,605

93,853

Intersegment Eliminations and Other [Member]

Segment Reporting Information [Line Items]

Sales

^[2]

(223,464)

(185,922)

662,129

(544,863)

Corporate, Non-Segment [Member]

Segment Reporting Information [Line Items]

Income from operations

$ (6,978)

$ (7,308)

$ (23,822)

$ (20,942)

[1]	Wood Products segment operating income for the three and nine months ended September 30, 2018, includes an impairment loss of $10.4 million upon classifying certain Wood Products facilities in Northeast Oregon as held for sale. For additional information, see Note 6, Assets Held For Sale.
[2]	Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

X

- Definition

Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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