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Stock-Based Compensation Stock Compensation Table (Tables)
 3 Months Ended
Mar. 25, 2020
Stock-based compensation [Abstract]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
A summary of stock option activity as of March 25, 2020 and changes during the thirteen weeks ended March 25, 2020 is as follows:

 
Shares
 
Weighted-Average
Exercise Price
Outstanding - December 25, 2019
2,077,570

 
$
8.14

Forfeited, cancelled or expired
(42,736
)
 
$
11.47

Outstanding - March 25, 2020
2,034,834

 
$
8.07

Vested and expected to vest at March 25, 2020
2,026,518

 
$
8.05

Exercisable at March 25, 2020
1,518,145

 
$
6.93
Nonvested Restricted Stock Shares Activity [Table Text Block]
A summary of restricted share activity as of March 25, 2020 and changes during the thirteen weeks ended March 25, 2020 is as follows:

 
Shares
 
Weighted-Average
Fair Value
Unvested shares at December 25, 2019
588,008

 
$
11.23

Forfeited, cancelled, or expired
(49,010
)
 
$
12.42

Unvested shares at March 25, 2020
538,998

 
$
11.12