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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Option Activity
The following table summarizes stock option activity (in thousands, except per share data):
 
Stock Options
 
Weighted Average Exercise Price
 
Aggregate Intrinsic Value
 
Weighted Average Remaining Term
Outstanding - December 30, 2017
420

 
$
5.45

 
$
14,068

 
5.7
Options granted
2

 
44.03

 
 
 
 
Options exercised
(136
)
 
3.34

 
 
 
 
Options canceled
(27
)
 
6.68

 
 
 
 
Outstanding - June 30, 2018
259

 
$
5.88

 
$
11,963

 
5.3
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]
The following table summarizes activity related to restricted stock units and performance stock units (in thousands, except per share data):
 
Restricted Stock Units
 
Weighted Average Grant Date Fair Value
 
Performance Stock Units
 
Weighted Average Grant Date Fair Value
Outstanding - December 30, 2017
94

 
$
27.11

 
86

 
$
27.63

Units granted
59

 
44.25

 
54

 
44.27

Units vested
(28
)
 
26.74

 
(14
)
 
26.25

Units canceled
(12
)
 
27.83

 
(7
)
 
26.30

Outstanding - June 30, 2018
113

 
$
36.07

 
119

 
$
38.31