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Quarterly Financial Data Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
First
 
Second
 
Third
 
Fourth
 
 
Year 2014
 
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Year
Net sales
 
$
183,390

 
$
198,966

 
$
176,419

 
$
186,672

 
$
745,447

Gross profit
 
$
15,636

 
$
15,732

 
$
7,318

 
$
11,536

 
$
50,222

Income (loss) from operations
 
$
7,702

 
$
8,444

 
$
(2,637
)
 
$
4,404

 
$
17,913

Income (loss) before income taxes
 
$
8,059

 
$
8,662

 
$
(2,740
)
 
$
1,721

 
$
15,702

Income tax (provision) benefit
 
$
(3,237
)
 
$
(3,623
)
 
$
321

 
$
(360
)
 
$
(6,899
)
Net income (loss)
 
$
4,822

 
$
5,039

 
$
(2,419
)
 
$
1,361

 
$
8,803

Income (loss) per share:
 
 
 
 

 
 

 
 

 
 

Basic
 
$
0.18

 
$
0.19

 
$
(0.09
)
 
$
0.05

 
$
0.33

Diluted
 
$
0.18

 
$
0.18

 
$
(0.09
)
 
$
0.05

 
$
0.33

Dividends declared per share
 
$
0.18

 
$
0.18

 
$
0.18

 
$
0.18

 
$
0.72

 
 
First
 
Second
 
Third
 
Fourth
 
 
Year 2015
 
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Year
Net sales
 
$
173,729

 
$
183,940

 
$
175,656

 
$
194,621

 
$
727,946

Gross profit
 
$
11,222

 
$
19,920

 
$
16,484

 
$
23,591

 
$
71,217

Income from operations
 
$
3,669

 
$
11,039

 
$
8,059

 
$
13,527

 
$
36,294

Income before income taxes
 
$
3,572

 
$
10,734

 
$
7,615

 
$
13,362

 
$
35,283

Income tax (provision) benefit
 
$
762

 
$
(4,200
)
 
$
(2,669
)
 
$
(5,232
)
 
$
(11,339
)
Net income
 
$
4,334

 
$
6,534

 
$
4,946

 
$
8,130

 
$
23,944

Income per share:
 
 
 
 
 
 
 
 
 
 
Basic
 
$
0.16

 
$
0.24

 
$
0.19

 
$
0.31

 
$
0.90

Diluted
 
$
0.16

 
$
0.24

 
$
0.19

 
$
0.31

 
$
0.90

Dividends declared per share
 
$
0.18

 
$
0.18

 
$
0.18

 
$
0.18

 
$
0.72