Segment Information

We operate our business using two reportable segments: Wood Products and Building Materials Distribution. Corporate and Other results are presented as reconciling items to arrive at total net sales and operating income. There are no differences in our basis of measurement of segment profit or loss from those disclosed in Note 14, Segment Information, of the Notes to Consolidated Financial Statements in "Item 8. Financial Statements and Supplementary Data" in our 2017 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 June 30				Six Months Ended June 30
	2018		2017		2018		2017
	(millions)
Wood Products
LVL (a)	$	9.8	$	9.3	$	23.2	$	25.3
I-joists (a)	7.9		7.6		17.8		18.7
Other engineered wood products (a)	5.8		5.4		12.3		10.4
Plywood and veneer	96.7		79.2		183.7		151.6
Lumber	25.0		22.5		49.9		43.5
Byproducts (b)	22.8		13.4		44.9		27.3
Particleboard	11.8		11.7		22.6		22.5
Other	14.7		9.1		30.2		17.7
	194.3		158.2		384.8		317.0

Building Materials Distribution
Commodity	602.7		453.8		1,093.2		832.8
General line	392.9		341.6		708.1		617.4
Engineered wood products	218.2		185.3		404.8		346.2
	1,213.8		980.7		2,206.1		1,796.4
	$	1,408.1	$	1,138.9	$	2,591.0	$	2,113.4

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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 six months ended June 30, 2018, approximately 73% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.


(b)	As discussed in Note 3, Revenues, prior period amounts have not been adjusted under the modified retrospective method upon adoption of ASC Topic 606, Revenue from Contracts with Customers.

An analysis of our operations by segment is as follows:



	Three Months Ended June 30						Six Months Ended June 30
	2018			2017			2018			2017
	(thousands)
Net sales by segment
Wood Products	$	425,483		$	350,277		$	823,474		$	675,934
Building Materials Distribution	1,213,783			980,706			2,206,164			1,796,389
Intersegment eliminations and other (a)	(231,134		)	(192,044		)	(438,665		)	(358,941		)
Total net sales	$	1,408,132		$	1,138,939		$	2,590,973		$	2,113,382

Segment operating income
Wood Products	$	36,482		$	15,395		$	62,603		$	22,783
Building Materials Distribution	47,713			34,509			80,101			54,474
Total segment operating income	84,195			49,904			142,704			77,257
Unallocated corporate and other	(10,139		)	(7,405		)	(16,844		)	(13,633		)
Income from operations	$	74,056		$	42,499		$	125,860		$	63,624

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(a)	Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.