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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Summarized Quarterly Financial Data
Summarized quarterly financial data is presented below:
 
 
2013
(In thousands, except per share amounts)
March 31,
 
June 30,
 
September 30,
 
December 31,
Net sales
$
114,722

 
$
136,109

 
$
142,389

 
$
136,134

Gross profit
32,549

 
37,836

 
40,449

 
40,628

Operating income
3,895

 
9,976

 
10,471

 
7,812

Net income
2,946

 
5,841

 
8,623

 
5,553

Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.20

 
$
0.39

 
$
0.56

 
$
0.36

Diluted
$
0.19

 
$
0.38

 
$
0.55

 
$
0.35

Shares used in computing earnings per share:
 
 
 
 
 
 
 
Basic
14,965

 
15,098

 
15,324

 
15,602

Diluted
15,225

 
15,419

 
15,743

 
16,011

 
 
2012
(In thousands, except per share amounts)
March 31,
 
June 30,
 
September 30,
 
December 31,
Net sales
$
103,732

 
$
116,704

 
$
124,871

 
$
117,783

Gross profit
28,327

 
32,970

 
36,438

 
35,702

Operating income
2,312

 
6,466

 
9,534

 
7,890

Net income
1,632

 
5,153

 
6,850

 
2,918

Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.11

 
$
0.35

 
$
0.46

 
$
0.19

Diluted
$
0.11

 
$
0.34

 
$
0.45

 
$
0.19

Shares used in computing earnings per share:
 
 
 
 
 
 
 
Basic
14,871

 
14,933

 
14,984

 
15,016

Diluted
15,108

 
15,048

 
15,099

 
15,180

 
(1) 
The earnings per common share calculations for each of the quarters were based upon the weighted average number of shares and share equivalents outstanding during each period, and the sum of the quarters may not be equal to the full year earnings per share amounts.