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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
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):
 
2017
 
2016
 
2015
Net sales:
 
 
 
 
 
Residential Products
$
466,603

 
$
430,938

 
$
475,653

Industrial and Infrastructure Products
215,211

 
296,513

 
378,224

Less: Intersegment sales
(1,247
)
 
(1,495
)
 
(1,536
)
 
213,964

 
295,018

 
376,688

Renewable Energy and Conservation
306,351

 
282,025

 
188,532

Total consolidated net sales
$
986,918

 
$
1,007,981

 
$
1,040,873

 
 
 
 
 
 
Income (loss) from operations:
 
 
 
 
 
Residential Products
$
76,893

 
$
65,241

 
$
46,804

Industrial and Infrastructure Products
8,159

 
1,306

 
15,581

Renewable Energy and Conservation
30,218

 
43,214

 
12,659

Unallocated corporate expenses
(22,421
)
 
(36,273
)
 
(26,312
)
 
$
92,849

 
$
73,488

 
$
48,732

Depreciation and Amortization
 
 
 
 
 
Residential Products
$
9,183

 
$
9,297

 
$
9,967

Industrial and Infrastructure Products
6,529

 
8,237

 
12,108

Renewable Energy and Conservation
5,657

 
6,203

 
7,811

Unallocated corporate expenses
321

 
377

 
662

 
$
21,690

 
$
24,114

 
$
30,548

Total assets
 
 
 
 
 
Residential Products
$
358,838

 
$
331,975

 
$
363,339

Industrial and Infrastructure Products
203,455

 
225,691

 
273,987

Renewable Energy and Conservation
219,806

 
207,241

 
215,211

Unallocated corporate assets
209,286

 
153,338

 
37,235

 
$
991,385

 
$
918,245

 
$
889,772

Capital expenditures
 
 
 
 
 
Residential Products
$
5,236

 
$
5,182

 
$
3,328

Industrial and Infrastructure Products
2,094

 
2,060

 
4,846

Renewable Energy and Conservation
3,648

 
3,160

 
3,871

Unallocated corporate expenditures
421

 
377

 
328

 
$
11,399

 
$
10,779

 
$
12,373
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):
 
2017
 
2016
 
2015
Net sales
 
 
 
 
 
North America
$
977,942

 
$
963,797

 
$
968,414

Europe
1,131

 
19,447

 
48,216

Asia
7,845

 
24,737

 
24,243

Total
$
986,918

 
$
1,007,981

 
$
1,040,873

 
 
 
 
 
 
Long-lived assets
 
 
 
 
 
North America
$
97,956

 
$
108,334

 
$
110,571

Europe
3,222

 
2,900

 
11,084

Asia
601

 
992

 
1,292

Total
$
101,779

 
$
112,226

 
$
122,947