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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Reconciliation Of Sales To Earnings Before Income Taxes by Segment
The following table illustrates certain measurements used by management to assess performance of the segments described above for the three and nine months ended September 30, (in thousands):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Net sales:
 
 
 
 
 
 
 
Residential Products
$
129,501

 
$
117,957

 
$
361,304

 
$
338,069

Renewable Energy and Conservation
88,135

 
82,008

 
202,690

 
204,648

Industrial and Infrastructure Products
57,162

 
73,193

 
165,806

 
234,590

Less: Intersegment sales
(224
)
 
(424
)
 
(994
)
 
(1,164
)
Net Industrial and Infrastructure Products
56,938

 
72,769

 
164,812

 
233,426

Total consolidated net sales
$
274,574

 
$
272,734

 
$
728,806

 
$
776,143

 
 
 
 
 
 
 
 
Income from operations:
 
 
 
 
 
 
 
Residential Products
$
23,764

 
$
19,407

 
$
61,984

 
$
52,363

Renewable Energy and Conservation
11,549

 
16,366

 
18,381

 
34,969

Industrial and Infrastructure Products
2,554

 
1,913

 
5,914

 
11,429

Unallocated Corporate Expenses
(2,174
)
 
(11,164
)
 
(15,977
)
 
(25,902
)
Total income from operations
$
35,693

 
$
26,522

 
$
70,302

 
$
72,859