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Quarterly Financial Data Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
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

 
 
First
 
Second
 
Third
 
Fourth
 
 
Year 2016
 
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Year
Net sales
 
$
186,065

 
$
182,709

 
$
175,580

 
$
188,323

 
$
732,677

Gross profit
 
$
27,715

 
$
29,540

 
$
10,981

 
$
17,968

 
$
86,204

Income from operations
 
$
18,722

 
$
19,540

 
$
5,250

 
$
11,090

 
$
54,602

Income before income taxes
 
$
19,022

 
$
19,247

 
$
4,910

 
$
11,542

 
$
54,721

Income tax (provision) benefit
 
$
(4,558
)
 
$
(6,082
)
 
$
1,064

 
$
(3,764
)
 
$
(13,340
)
Net income
 
$
14,464

 
$
13,165

 
$
5,974

 
$
7,778

 
$
41,381

Income per share:
 
 
 
 
 
 
 
 
 
 
Basic
 
$
0.56

 
$
0.52

 
$
0.24

 
$
0.31

 
$
1.63

Diluted
 
$
0.56

 
$
0.52

 
$
0.23

 
$
0.31

 
$
1.62

Dividends declared per share
 
$
0.18

 
$
0.18

 
$
0.18

 
$
0.18

 
$
0.72