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Share-based Compensation, Options (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 25, 2018
Dec. 26, 2017
Aggregate Intrinsic Value      
Proceeds from exercise of stock options     $ 1,558
Stock Options      
Shares      
Granted (in shares) 0 0 0
Stock options vested (in shares) 0 0 0
Aggregate Intrinsic Value      
Intrinsic value of options exercised (in dollars)     $ 4,000
Proceeds from exercise of stock options     1,600
Excess tax benefit recorded in additional paid-in capital     $ 1,000