Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

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):

	2019			2018			2017
Net sales:
Renewable Energy and Conservation	$	373,023		$	317,253		$	306,351
Residential Products	461,630			463,216			466,603
Industrial and Infrastructure Products	213,805			223,006			215,211
Less: Intersegment sales	(1,019		)	(1,103		)	(1,247		)
Net Industrial and Infrastructure Products	212,786			221,903			213,964
Total consolidated net sales	$	1,047,439		$	1,002,372		$	986,918
Income from operations:
Renewable Energy and Conservation	$	47,558		$	37,423		$	30,218
Residential Products	63,047			69,838			76,893
Industrial and Infrastructure Products	13,455			15,336			8,159
Segments income from operations	124,060			122,597			115,270
Unallocated corporate expenses	(36,221		)	(28,629		)	(22,421		)
Total income from operations	$	87,839		$	93,968		$	92,849
Depreciation and Amortization
Renewable Energy and Conservation	$	6,132		$	5,790		$	5,657
Residential Products	7,906			8,217			9,183
Industrial and Infrastructure Products	5,521			6,035			6,529
Unallocated corporate expenses	390			332			321
	$	19,949		$	20,374		$	21,690
Total assets
Renewable Energy and Conservation	$	246,853		$	218,048		$	219,806
Residential Products	359,657			361,499			358,838
Industrial and Infrastructure Products	203,465			210,482			203,455
Unallocated corporate assets	174,475			271,616			209,286
	$	984,450		$	1,061,645		$	991,385
Capital expenditures
Renewable Energy and Conservation	$	2,199		$	1,345		$	3,648
Residential Products	4,968			7,921			5,236
Industrial and Infrastructure Products	3,436			3,016			2,094
Unallocated corporate expenditures	581			175			421
	$	11,184		$	12,457		$	11,399

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):

	2019
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	42,596	$	458,006	$	175,696	$	676,298
Over Time	330,427		3,624		37,090		371,141
Total	$	373,023	$	461,630	$	212,786	$	1,047,439
	2018
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	33,427	$	460,513	$	188,081	$	682,021
Over Time	283,826		2,703		33,822		320,351
Total	$	317,253	$	463,216	$	221,903	$	1,002,372
	2017
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	30,137	$	466,603	$	213,964	$	710,704
Over Time	276,214		—		—		276,214
Total	$	306,351	$	466,603	$	213,964	$	986,918

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):

	2019		2018		2017
Net sales
North America	$	1,030,638	$	990,772	$	977,942
Europe	—		—		1,131
Asia	16,801		11,600		7,845
Total	$	1,047,439	$	1,002,372	$	986,918
Long-lived assets
North America	$	96,847	$	96,342	$	97,956
Europe	—		—		3,222
Asia	542		704		601
Total	$	97,389	$	97,046	$	101,779