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Summarized Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Operating Results

The following table presents unaudited quarterly operating results for each of our last eight fiscal quarters. This information has been prepared on a basis consistent with our audited financial statements and includes all adjustments, consisting only of normal recurring adjustments, considered necessary for a fair presentation of the data.

Unaudited Quarterly Operating Results

(In thousands, except for per share amounts)

 

Three Months Ended

 

March 31, 2017

 

 

June 30, 2017

 

 

September 30, 2017

 

 

December 31, 2017

 

Net sales

 

$

170,279

 

 

$

184,673

 

 

$

185,112

 

 

$

126,836

 

Gross profit

 

$

73,715

 

 

$

84,632

 

 

$

86,498

 

 

$

58,815

 

Operating income

 

$

7,032

 

 

$

16,448

 

 

$

18,318

 

 

$

(4,061

)

Net income

 

$

6,651

 

 

$

12,401

 

 

$

15,898

 

 

$

(11,110

)

Earnings per common share

 

$

0.14

 

 

$

0.26

 

 

$

0.33

 

 

$

(0.23

)

Earnings per common share assuming dilution (1)

 

$

0.14

 

 

$

0.26

 

 

$

0.33

 

 

$

(0.23

)

 

Three Months Ended

 

March 31, 2016

 

 

June 30, 2016

 

 

September 30, 2016

 

 

December 31, 2016

 

Net sales

 

$

142,204

 

 

$

162,701

 

 

$

168,890

 

 

$

162,986

 

Gross profit

 

$

65,794

 

 

$

78,955

 

 

$

75,808

 

 

$

70,787

 

Operating income

 

$

5,521

 

 

$

14,812

 

 

$

10,130

 

 

$

4,272

 

Net income

 

$

5,014

 

 

$

10,228

 

 

$

12,415

 

 

$

7,572

 

Earnings per common share

 

$

0.10

 

 

$

0.21

 

 

$

0.26

 

 

$

0.16

 

Earnings per common share assuming dilution (1)

 

$

0.10

 

 

$

0.21

 

 

$

0.26

 

 

$

0.16

 

 

(1)

Assumes exercise of dilutive stock options calculated under the treasury stock method.