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Quarterly Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of selected quarterly financial data
The following tables summarize selected quarterly financial data for the years ended December 31, 2018 and 2017:
  
 
2018
(Thousands except per share amounts)
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Net sales
 
$
303,467

 
$
309,085

 
$
297,193

 
$
298,070

 
$
1,207,815

Gross margin
 
58,280

 
61,838

 
64,935

 
66,052

 
251,105

Percent of net sales
 
19.2
%
 
20.0
%
 
21.8
%
 
22.2
%
 
20.8
%
Net income (loss)
 
$
10,564

 
$
11,144

 
$
19,966

 
$
(20,828
)
 
$
20,846

Net income (loss) per share of common stock:
 
 
 
 
 
 
 
 
 
 
Basic(1)
 
$
0.52

 
$
0.55

 
$
0.99

 
$
(1.03
)
 
$
1.03

  Diluted(1)(3)
 
0.51

 
0.54

 
0.97

 
(1.03
)
 
1.01

 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Net sales
 
$
240,669

 
$
295,842

 
$
294,268

 
$
308,668

 
$
1,139,447

Gross margin
 
43,156

 
54,895

 
55,793

 
58,985

 
212,829

Percent of net sales
 
17.9
%
 
18.6
%
 
19.0
%
 
19.1
%
 
18.7
%
Net income (loss)
 
$
3,050

 
$
7,313

 
$
9,320

 
$
(8,232
)
 
$
11,451

Net income (loss) per share of common stock:
 
 
 
 
 
 
 
 
 
 
Basic(2)
 
$
0.15

 
$
0.37

 
$
0.47

 
$
(0.41
)
 
$
0.57

Diluted(2)(3)
 
0.15

 
0.36

 
0.46

 
(0.41
)
 
0.56