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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018 (in thousands, except per share data):
 
 
First
 
Second
 
Third
 
Fourth
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Net Sales
$
468,589

 
$
465,420

 
$
468,711

 
$
454,981

 
$
477,761

 
$
460,253

 
$
443,836

 
$
453,409

Gross Profit
169,645

 
172,628

 
176,538

 
172,804

 
180,321

 
172,990

 
161,805

 
172,044

Operating Income
121,596

 
128,515

 
127,905

 
126,683

 
128,136

 
127,428

 
110,901

 
125,499

Net Income
104,280

 
111,249

 
108,959

 
109,024

 
111,898

 
111,336

 
99,547

 
106,275

Earnings Per Share (Basic)(1)
$
0.40

 
$
0.40

 
$
0.42

 
$
0.40

 
$
0.44

 
$
0.42

 
$
0.39

 
$
0.41

Earnings Per Share (Diluted)(1)
$
0.40

 
$
0.40

 
$
0.42

 
$
0.40

 
$
0.44

 
$
0.42

 
$
0.39

 
$
0.41

(1)Basic and diluted earnings per share are computed independently for each quarter presented.  Therefore the sum of quarterly basic and diluted per share information may not equal annual basis and diluted earnings per share.