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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Quarterly data for the years ended December 31, 2017 and 2016 consisted of the following (in thousands, except per share amounts):
 
Quarter Ended
 
March 31
 
June 30
 
September 30
 
December 31
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

 
 
 
 
 
 
 
 
2016
 

 
 

 
 

 
 

Net sales
$
138,077

 
$
151,071

 
$
156,975

 
$
157,715

Gross profit
60,100

 
66,854

 
67,815

 
70,256

Income from operations
7,706

 
11,581

 
2,987

 
12,602

Income tax expense (benefit)
1,555

 
2,572

 
(978
)
 
2,116

Net income
4,351

 
7,290

 
973

 
7,507

Basic earnings per common share
0.10

 
0.16

 
0.02

 
0.17

Diluted earnings per common share
0.10

 
0.16

 
0.02

 
0.17