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Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Measurements Used by Management to Assess Performance of Segments

The following table illustrates certain measurements used by management to assess the performance of the segments described above as of and for the years ended December 31 (in thousands):

	2018				2017				2016
Net sales:
Residential Products	$	463,216			$	466,603			$	430,938
Industrial and Infrastructure Products	223,006				215,211				296,513
Less: Intersegment sales	(1,103		)		(1,247		)		(1,495		)
	221,903				213,964				295,018
Renewable Energy and Conservation	317,253				306,351				282,025
Total consolidated net sales	$	1,002,372			$	986,918			$	1,007,981
Income from operations:
Residential Products	$	69,838			$	76,893			$	65,241
Industrial and Infrastructure Products	15,336				8,159				1,306
Renewable Energy and Conservation	37,423				30,218				43,214
Segments income from operations	122,597				115,270				109,761
Unallocated corporate expenses	(28,629		)		(22,421		)		(36,273		)
Total income from operations	$	93,968			$	92,849			$	73,488
Depreciation and Amortization
Residential Products	$	8,217			$	9,183			$	9,297
Industrial and Infrastructure Products	6,035				6,529				8,237
Renewable Energy and Conservation	5,790				5,657				6,203
Unallocated corporate expenses	332				321				377
	$	20,374			$	21,690			$	24,114
Total assets
Residential Products	$	361,499			$	358,838			$	331,975
Industrial and Infrastructure Products	210,482				203,455				225,691
Renewable Energy and Conservation	218,048				219,806				207,241
Unallocated corporate assets	271,616				209,286				153,338
	$	1,061,645			$	991,385			$	918,245
Capital expenditures
Residential Products	$	7,921			$	5,236			$	5,182
Industrial and Infrastructure Products	3,016				2,094				2,060
Renewable Energy and Conservation	1,345				3,648				3,160
Unallocated corporate expenditures	175				421				377
	$	12,457			$	11,399			$	10,779

Disaggregation of Revenue

The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the years ended December 31 (in thousands):

	2018
	Residential Products				Industrial and Infrastructure Products				Renewable Energy and Conservation				Total
Net sales:
Point in Time	$	460,513			$	188,081			$	33,427			$	682,021
Over Time	2,703				33,822				283,826				320,351
Total	$	463,216			$	221,903			$	317,253			$	1,002,372
	2017
	Residential Products				Industrial and Infrastructure Products				Renewable Energy and Conservation				Total
Net sales:
Point in Time	$	466,603			$	213,964			$	30,137			$	710,704
Over Time	—				—				276,214				276,214
Total	$	466,603			$	213,964			$	306,351			$	986,918
	2016
	Residential Products				Industrial and Infrastructure Products				Renewable Energy and Conservation				Total
Net sales:
Point in Time	$	430,938			$	295,018			$	21,566			$	747,522
Over Time	—				—				260,459				260,459
Total	$	430,938			$	295,018			$	282,025			$	1,007,981

Net Sales by Region or Origin and Long-Lived Assets by Region of Domicile

Net sales by region or origin and long-lived assets by region of domicile for the years ended and as of December 31 are as follows (in thousands):

	2018				2017				2016
Net sales
North America	$	990,772			$	977,942			$	963,797
Europe	—				1,131				19,447
Asia	11,600				7,845				24,737
Total	$	1,002,372			$	986,918			$	1,007,981
Long-lived assets
North America	$	96,342			$	97,956			$	108,334
Europe	—				3,222				2,900
Asia	704				601				992
Total	$	97,046			$	101,779			$	112,226

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