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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Selected Quarterly Financial Data
Selected quarterly financial data for 2018 and 2017 are as follows:
 
Three Months Ended
 
March
 
June
 
September(1)
 
December(2)
2018
 
 
 
 
 
 
 
Net sales
$
202,064

 
$
212,820

 
$
202,307

 
$
242,444

Gross profit
109,557

 
116,271

 
110,627

 
132,655

Net income
10,657

 
8,719

 
5,825

 
15,653

EPS:
 

 
 

 
 

 
 

Basic
$
.38

 
$
.31

 
$
.21

 
$
.56

Diluted
.37

 
.30

 
.20

 
.54


 
Three Months Ended
 
March(3)
 
June(4)
 
September(5)
 
December(6)
2017
 
 
 
 
 
 
 
Net sales
$
186,567

 
$
197,154

 
$
190,117

 
$
222,555

Gross profit
99,885

 
104,652

 
102,547

 
123,958

Net income (loss)
(4,545
)
 
6,139

 
7,197

 
46,696

EPS:
 

 
 

 
 

 
 

Basic
$
(.16
)
 
$
.22

 
$
.26

 
$
1.67

Diluted
(.16
)
 
.22

 
.26

 
1.65