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Share-based Compensation, Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Dec. 29, 2015
Aggregate Intrinsic Value      
Proceeds from exercise of stock options $ 1,558 $ 2,673 $ 4,696
Stock Options      
Shares      
Outstanding at the beginning of the period (in shares) 118,073    
Granted (in shares) 0 0 0
Cancelled/Expired (in shares) (2,836)    
Exercised (in shares) (115,237)    
Outstanding at the end of the period (in shares)   118,073  
Stock options vested (in shares) 0 0 0
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 13.57    
Cancelled/Expired (in dollars per share) 15.47    
Exercised (in dollars per share) $ 13.52    
Outstanding at the end of the period (in dollars per share)   $ 13.57  
Aggregate Intrinsic Value      
Intrinsic value of options exercised (in dollars) $ 4,000 $ 6,300 $ 6,500
Proceeds from exercise of stock options 1,600 2,700 4,700
Excess tax benefit realized from tax deductions associated with options exercised $ 1,000    
Excess tax benefit recorded in additional paid-in capital   $ 1,800 $ 1,700