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Equity Plans Restricted Stock and Deferred Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 26, 2018
Nov. 06, 2017
Apr. 26, 2017
Jan. 24, 2017
Aug. 04, 2014
Dec. 31, 2020
Dec. 31, 2017
Restricted Stock and Deferred Restricted Stock [Member]              
Restricted and Deferred Restricted Stock Awards Outstanding [Roll Forward]              
Outstanding as of January 1, 2016, units             192,720
Issued, units             48,754
Exercised, units             (50,978)
Forfeited or expired             0
Outstanding as of December 31, 2016, units             190,496
Shares vested as of December 31, 2016, shares             103,013
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             $ 21.69
Issued, wtd avg grant date fair value             52.19
Exercised, wtd avg grant date fair value             27.99
Forfeited or expired, wtd avg grant date fair value             0.00
Outstanding as od December 31, 2016, wtd avg grant date fair value             27.81
Shares vested as of December 31, 2016, wtd avg grant date fair value             $ 16.71
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             85,903
Granted, units             48,754
Vested, units             (47,174)
Forfeited, units             0
Nonvested as of December 31, 2016, units             87,483
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             $ 28.00
Granted, wtd avg grant date fair value             52.19
Vested, wtd avg grant date fair value             29.10
Forfeited, wtd avg grant date fair value             0.00
Nonvested as of December 31, 2016, wtd avg grant date fair value             $ 40.89
Unrecognized compensation cost             $ 1,569
Period for recognition of compensation cost             1 year 1 month 21 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   14,552   10,744 19,917    
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, wtd avg grant date fair value       $ 48.56      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share   $ 59.31     $ 26.81    
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       2,737      
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% 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       $ 50.24      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       150.00% 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     9,240        
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Granted, wtd avg grant date fair value     $ 51.13        
Scenario, Forecast [Member] | Officer [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 200.00%         100.00%  
Scenario, Forecast [Member] | Executive Officers [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 150.00%            
Share-based Compensation Award, Tranche One [Member] | 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, Award Vesting Rights, Percentage       0.00%      
Share-based Compensation Award, Tranche One [Member] | 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, Award Vesting Rights, Percentage       100.00%      
Share-based Compensation Award, Tranche Two [Member] | 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, Award Vesting Rights, Percentage       0.00%      
Share-based Compensation Award, Tranche Two [Member] | 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, Award Vesting Rights, Percentage       150.00%