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Segment Information (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, (in thousands):
 
Three Months Ended 
 March 31,
 
2017
 
2016
Net sales:
 
 
 
Residential Products
$
104,551

 
$
100,147

Industrial and Infrastructure Products
50,718

 
80,017

Less: Intersegment sales
(456
)
 
(367
)
 
50,262

 
79,650

Renewable Energy and Conservation
51,792

 
57,874

Total consolidated net sales
$
206,605

 
$
237,671

 
 
 
 
Income from operations:
 
 
 
Residential Products
$
15,641

 
$
12,231

Industrial and Infrastructure Products
(37
)
 
3,326

Renewable Energy and Conservation
3,340

 
8,307

Unallocated Corporate Expenses
(9,265
)
 
(6,103
)
Total income from operations
$
9,679

 
$
17,761