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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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 26, 2015
1,177

 
$
4.66

 
$
21,059

 
7.7
Granted
36

 
$
24.34

 
 
 
 
Exercised
(166
)
 
$
2.92

 
 
 
 
Canceled
(192
)
 
$
5.99

 
 
 
 
Outstanding - December 31, 2016
855

 
$
5.14

 
$
20,905

 
6.8
Schedule of Nonvested Share Activity
A summary of the status of non-vested shares as of December 31, 2016 and the changes during the period then ended is presented below:
 
December 31, 2016
 
Shares
 
Weighted average
grant-date fair value
Non-vested shares at beginning of year
955

 
$
4.88

Granted
36

 
$
24.34

Vested
(299
)
 
$
2.64

Forfeited
(192
)
 
$
5.99

Non-vested shares at end of year
500

 
$
7.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
The weighted-average assumptions used in the model were as follows:
 
2016
 
2015
 
2014
Risk-free interest
1.44
%
 
1.96
%
 
1.96
%
Expected life (years)
6.2

 
6.5

 
6.5

Expected dividend yield
0
%
 
0
%
 
0
%
Volatility
52.0
%
 
52.0
%
 
50.8
%
Weighted-average Black-Scholes fair value per share at date of grant
$
13.74

 
$
8.87

 
$
3.87