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Quarterly Result of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results of Operations
Quarter ended
 
March 31,
2016
 
June 30,
2016
 
September 30,
2016
 
December 31,
2016
Sales
 
$
75,748

 
$
78,538

 
$
79,600

 
$
91,698

Gross profit
 
42,671

 
43,934

 
42,678

 
48,677

Net income
 
3,080

 
3,392

 
1,090

 
3,545

Net income per share:
 
 
 
 
 
 
 
 
Basic
 
$
0.19

 
$
0.20

 
$
0.07

 
$
0.21

Diluted
 
$
0.19

 
$
0.20

 
$
0.07

 
$
0.21

 
Quarter ended
 
March 28,
2015
 
June 27,
2015
 
September 26,
2015
 
December 31,
2015
Sales
 
$
69,939

 
$
83,775

 
$
72,507

 
$
91,327

Gross profit
 
39,506

 
44,441

 
34,766

 
48,523

Net income (loss)
 
664

 
4,148

 
(884
)
 
8,885

Net income (loss) per share:
 
 
 
 
 
 
 
 
Basic
 
$
0.04

 
$
0.24

 
$
(0.05
)
 
$
0.52

Diluted
 
$
0.04

 
$
0.24

 
$
(0.05
)
 
$
0.52