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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Summarizes Quarterly Financial Results
The following table summarizes quarterly financial results for 2016 and 2015. In management’s opinion, all material adjustments necessary for a fair statement of the information for such quarters have been reflected.
 
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
In thousands except per share data
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Net sales
$
129,700

 
$
127,306

 
$
137,235

 
$
134,561

 
$
155,725

 
$
131,240

 
$
144,192

 
$
131,398

Gross profit
$
32,377

 
$
27,700

 
$
35,990

 
$
33,889

 
$
38,193

 
$
31,691

 
$
31,982

 
$
29,217

Net income
$
9,169

 
$
18,937

 
$
10,813

 
$
10,817

 
$
12,785

 
$
11,186

 
$
4,420

 
$
5,319

Earnings per common share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.54

 
$
1.12

 
$
0.64

 
$
0.65

 
$
0.76

 
$
0.67

 
$
0.26

 
$
0.32

Diluted
$
0.54

 
$
1.11

 
$
0.63

 
$
0.64

 
$
0.75

 
$
0.66

 
$
0.26

 
$
0.31