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Supplementary Information - Quarterly Results of Operations (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
The following table summarizes our unaudited quarterly financial data for 2014 and 2013 (in thousands, except per share amounts):
 
 
Quarter Ended
 
 
 
March 31
 
June 30
 
September 30
 
December 31
 
Total
2014
 
 
 
 
 
 
 
 
 
Net sales
$
71,903

 
$
48,546

 
$
59,067

 
$
94,931

 
$
274,447

Gross profit
38,481

 
24,780

 
28,795

 
48,519

 
140,575

Operating income
9,001

 
2,379

 
4,281

 
14,493

 
30,154

Income from continuing operations
5,748

 
1,498

 
2,664

 
10,473

 
20,383

Loss from discontinued operations
(374
)
 
(941
)
 
(177
)
 
(96
)
 
(1,588
)
Net income(1)
5,374

 
557

 
2,487

 
10,377

 
18,795

Net income per share:
 
 
 
 
 
 
 
 
 
Basic
$
0.17

 
$
0.02

 
$
0.08

 
$
0.33

 
$
0.60

Diluted (2)
0.17

 
0.02

 
0.08

 
0.33

 
0.59

 
 
 
 
 
 
 
 
 
 
2013
 
 
 
 
 
 
 
 
 
Net sales
$
59,214

 
$
36,242

 
$
46,256

 
$
77,091

 
$
218,803

Gross profit
30,694

 
17,329

 
21,777

 
36,677

 
106,477

Operating income (loss)
5,994

 
(1,724
)
 
1,336

 
10,118

 
15,724

Income from continuing operations
5,524

 
32,668

 
1,500

 
8,432

 
48,124

Income (loss) from discontinued operations
(365
)
 
195

 
(116
)
 
116

 
(170
)
Net income (1)
5,159

 
32,863

 
1,384

 
8,548

 
47,954

Net income per share:
 
 
 
 
 
 
 
 
 
Basic
$
0.17

 
$
1.06

 
$
0.04

 
$
0.27

 
$
1.54

Diluted (2)
0.17

 
1.05

 
0.04

 
0.27

 
1.52


(1) Net income in the quarters ended December 31, 2014 and June 30, 2013 included a $1.2 million and a $35.8 million credit, respectively, related to the reversal of a portion of our deferred tax asset valuation allowance.

(2) May not add due to rounding.