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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (Unaudited)
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

The following table sets forth selected financial information for all of the quarters during the years ended December 31, 2017 and 2016 (in thousands, except per share data):
 
 
First
 
Second
 
Third
 
Fourth
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net Sales
$
453,535

 
$
405,568

 
$
443,139

 
$
423,801

 
$
438,628

 
$
429,643

 
$
459,570

 
$
419,913

Gross Profit
175,801

 
158,691

 
167,208

 
166,773

 
171,230

 
173,822

 
180,290

 
169,167

Operating Income
134,427

 
120,849

 
125,865

 
128,746

 
129,073

 
134,212

 
133,994

 
127,936

Net Income
97,557

 
80,280

 
88,536

 
86,485

 
90,230

 
92,065

 
130,469

 
88,761

Earnings Per Share (Basic)
$
0.34

 
$
0.28

 
$
0.31

 
$
0.30

 
$
0.32

 
$
0.32

 
$
0.46

 
$
0.31

Earnings Per Share (Diluted)
$
0.33

 
$
0.28

 
$
0.31

 
$
0.30

 
$
0.31

 
$
0.32

 
$
0.46

 
$
0.31