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Stock-Based Compensation (Tables)
 6 Months Ended
Jul. 01, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Nonvested Share Activity [Table Text Block]
A summary of all non-vested shares activity for the six months ended July 1, 2018 was as follows:
 
Shares
 
Weighted Average Grant Date Price
Non-vested at December 31, 2017
722,459

 
$
12.76

Granted
380,192

 
13.25

Vested
(286,586
)
 
12.48

Non-vested at July 1, 2018
816,065

 
$
13.09