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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information Quarterly data for the years ended December 31, 2018 and 2017 consisted of the following (in thousands, except per share amounts):
 
Quarter Ended
 
March 31
 
June 30
 
September 30
 
December 31
2018
 

 
 

 
 

 
 

Net sales
$
203,035

 
$
224,810

 
$
221,659

 
$
233,249

Gross profit
88,056

 
100,009

 
102,039

 
104,666

Income from operations
8,781

 
15,114

 
21,061

 
13,661

Income tax expense
1,090

 
624

 
2,766

 
3,022

Net income
5,269

 
10,941

 
16,619

 
9,188

Basic earnings per common share
0.10

 
0.22

 
0.31

 
0.17

Diluted earnings per common share
0.10

 
0.21

 
0.30

 
0.16

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 

 
 

 
 

 
 

Net sales
$
171,069

 
$
186,549

 
$
179,337

 
$
190,897

Gross profit
75,942

 
84,141

 
80,514

 
85,656

Income from operations
5,609

 
13,362

 
879

 
13,219

Income tax expense
690

 
1,830

 
1,364

 
4,474

Net income (loss)
14,803

 
9,483

 
(3,569
)
 
6,806

Basic earnings per common share
0.33

 
0.19

 
(0.07
)
 
0.14

Diluted earnings per common share
0.32

 
0.19

 
(0.07
)
 
0.13