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Segment Information (Notes)
9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Segment Information Segment Information
 
We operate our business using two reportable segments: Wood Products and Building Materials Distribution. Unallocated corporate costs are presented as reconciling items to arrive at operating income. There are no differences in our basis of measurement of segment profit or loss from those disclosed in Note 17, Segment Information, of the Notes to Consolidated Financial Statements in "Item 8. Financial Statements and Supplementary Data" in our 2019 Form 10-K.    

Wood Products and Building Materials Distribution segment sales to external customers, including related parties, by product line are as follows:
Three Months Ended
September 30
Nine Months Ended
September 30
2020201920202019
(millions)
Wood Products (a)
LVL$4.3 $7.9 $15.6 $31.8 
I-joists3.3 4.9 10.4 18.2 
Other engineered wood products5.6 6.2 17.2 20.5 
Plywood and veneer105.1 64.6 234.2 195.5 
Lumber13.3 13.5 37.9 40.7 
Byproducts16.1 18.3 52.5 56.4 
Other3.9 8.5 12.9 27.8 
151.6 123.9 380.7 391.0 
Building Materials Distribution  
Commodity718.9 467.9 1,649.1 1,316.7 
General line483.0 454.5 1,328.5 1,207.7 
Engineered wood products235.8 223.3 644.3 626.4 
1,437.7 1,145.6 3,621.9 3,150.7 
$1,589.3 $1,269.5 $4,002.6 $3,541.7 
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(a)Amounts represent sales to external customers. Sales are calculated after intersegment sales eliminations to our Building Materials Distribution segment, as well as the cost of EWP rebates and sales allowances provided at various stages of the supply chain (including distributors, retail lumberyards, and professional builders). For the nine months ended September 30, 2020, approximately 80% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.
An analysis of our operations by segment is as follows: 
 Three Months Ended
September 30
Nine Months Ended
September 30
 2020201920202019
 (thousands)
Net sales by segment
Wood Products$363,674 $325,102 $965,240 $978,881 
Building Materials Distribution1,437,683 1,145,621 3,621,940 3,150,750 
Intersegment eliminations (a)(212,044)(201,199)(584,573)(587,940)
Total net sales$1,589,313 $1,269,524 $4,002,607 $3,541,691 
Segment operating income
Wood Products (b)$66,035 $15,597 $86,872 $46,135 
Building Materials Distribution107,901 38,665 180,413 89,982 
Total segment operating income173,936 54,262 267,285 136,117 
Unallocated corporate costs(15,364)(9,364)(31,396)(24,433)
Income from operations$158,572 $44,898 $235,889 $111,684 
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(a)    Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

(b)    Wood Products segment operating income for the nine months ended September 30, 2020, includes $15.0 million of accelerated depreciation and $1.7 million of other closure-related costs due to the permanent curtailment of I-joist production at our Roxboro, North Carolina facility. For more information, see Note 5, Curtailment of Manufacturing Facility.