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Equity Plans Restricted Stock and Deferred Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 25, 2018
Jan. 30, 2018
Apr. 26, 2017
Dec. 31, 2018
Restricted Stock and Deferred Restricted Stock [Member]        
Restricted and Deferred Restricted Stock Awards Outstanding [Roll Forward]        
Outstanding as of January 1, 2016, units       190,496
Issued, units       58,211
Exercised, units       (143,614)
Forfeited or expired       0
Outstanding as of December 31, 2016, units       105,093
Shares vested as of December 31, 2016, shares       45,912
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward]        
Outstanding as of January 1, 2016, wtd avg grant date fair value       $ 27.81
Issued, wtd avg grant date fair value       50.29
Exercised, wtd avg grant date fair value       28.41
Forfeited or expired, wtd avg grant date fair value       0.00
Outstanding as od December 31, 2016, wtd avg grant date fair value       37.73
Shares vested as of December 31, 2016, wtd avg grant date fair value       $ 16.46
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested as of January 1, 2016, units       87,483
Granted, units       58,211
Vested, units       (86,513)
Forfeited, units       0
Nonvested as of December 31, 2016, units       59,181
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Nonvested as of January 1, 2016, wtd avg grant date fair value       $ 40.89
Granted, wtd avg grant date fair value       50.29
Vested, wtd avg grant date fair value       35.99
Forfeited, wtd avg grant date fair value       0.00
Nonvested as of December 31, 2016, wtd avg grant date fair value       $ 54.67
Unrecognized compensation cost       $ 1,801
Period for recognition of compensation cost       1 year 2 months 12 days
Officer [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted, units   4,081    
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Percentage Of Target Number Of Shares Expected To Vest       150.00%
Officer [Member] | Performance Shares 2 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted, units   5,259    
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, wtd avg grant date fair value   $ 55.89    
Officer [Member] | Performance Shares 3 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted, units   6,342    
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, wtd avg grant date fair value   $ 63.85    
Officer [Member] | Minimum [Member] | Performance Shares [Member]        
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   0.00%    
Officer [Member] | Minimum [Member] | Performance Shares 2 [Member]        
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Percentage Of Target Number Of Shares Expected To Vest       50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   0.00%    
Officer [Member] | Minimum [Member] | Performance Shares 3 [Member]        
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   0.00%    
Officer [Member] | Maximum [Member] | Performance Shares [Member]        
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, wtd avg grant date fair value   $ 58.02    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   150.00%    
Officer [Member] | Maximum [Member] | Performance Shares 2 [Member]        
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Percentage Of Target Number Of Shares Expected To Vest       100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   150.00%    
Officer [Member] | Maximum [Member] | Performance Shares 3 [Member]        
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   200.00%    
Non-employee Board Members [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted, units     7,385  
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, wtd avg grant date fair value $ 55.8