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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information The following table sets forth selected financial information for all of the quarters during the years ended December 31, 2018 and 2017 (in thousands, except per share data):
 
 
First
 
Second
 
Third
 
Fourth
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Net Sales
$
465,420

 
$
453,535

 
$
454,981

 
$
443,139

 
$
460,253

 
$
438,628

 
$
453,409

 
$
459,570

Gross Profit
172,628

 
175,801

 
172,804

 
167,208

 
172,990

 
171,230

 
172,044

 
180,290

Operating Income
128,515

 
134,427

 
126,683

 
125,865

 
127,428

 
129,073

 
125,499

 
133,994

Net Income
111,249

 
97,557

 
109,024

 
88,536

 
111,336

 
90,230

 
106,275

 
130,469

Earnings Per Share (Basic)
$
0.40

 
$
0.34

 
$
0.40

 
$
0.31

 
$
0.42

 
$
0.32

 
$
0.41

 
$
0.46

Earnings Per Share (Diluted)
$
0.40

 
$
0.33

 
$
0.40

 
$
0.31

 
$
0.42

 
$
0.31

 
$
0.41

 
$
0.46