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Employee Benefit Plans - Stock Option Activity (Details) - Stock Option Awards - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Number of Shares    
Options Outstanding, Beginning Balance (in shares) 307,000  
Exercised (in shares) (8,000) 0
Options Outstanding, Ending Balance (in shares) 299,000 307,000
Vested and Exercisable at end of year (in shares) 299,000  
Weighted Average Exercise Price    
Options Outstanding, Beginning Balance (in dollars per share) $ 20.72  
Exercised (in dollars per share) 15.51  
Options Outstanding, Ending Balance (in dollars per share) 20.86 $ 20.72
Vested and Exercisable at end of year (in dollars per share) $ 20.86  
Additional Information:    
Weighted average remaining contractual life, options outstanding at end of year 2 years 6 months  
Weighted average remaining contractual life, vested and exercisable at end of year 2 years 6 months  
Aggregate intrinsic value, options outstanding at end of year $ 18,029  
Aggregate intrinsic value, vested and exercisable at end of year $ 18,029