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Stock-Based Compensation Stock Compensation Table (Tables)
 6 Months Ended
Jun. 26, 2019
Stock-based compensation [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity as of June 26, 2019 and changes during the twenty-six weeks ended June 26, 2019 is as follows:

 
Shares
 
Weighted-Average
Exercise Price
Outstanding - December 26, 2018
2,102,404

 
$
7.68

Grants
320,536

 
11.47

Exercised
(6,709
)
 
11.94

Forfeited, cancelled or expired
(112,310
)
 
13.41

Outstanding - June 26, 2019
2,303,921

 
$
7.92

Vested and expected to vest at June 26, 2019
2,289,608

 
$
7.89

Exercisable at June 26, 2019
1,708,169

 
$
6.71
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of each stock option was estimated on the grant date using an exercise price of the closing stock price on the day prior to date of grant and the Black‑Scholes option-pricing model with the following weighted average assumptions:
 
Twenty-Six Weeks Ended June 26, 2019
 
Twenty-Six Weeks Ended June 27, 2018
Expected volatility
28.7
%
 
28.3
%
Risk-free interest rate
2.33
%
 
2.88
%
Expected term (years)
6.25

 
6.25

Expected dividends
—

 
—
Nonvested Restricted Stock Shares Activity [Table Text Block]
A summary of restricted share activity as of June 26, 2019 and changes during the twenty-six weeks ended June 26, 2019 is as follows:

 
Shares
 
Weighted-Average
Fair Value
Unvested shares at December 26, 2018
490,700

 
$
10.91

Granted
285,996

 
$
11.47

Released
(89,862
)
 
$
10.09

Forfeited, cancelled, or expired
(44,722
)
 
$
11.83

Unvested shares at June 26, 2019
642,112

 
$
11.21