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Equity Plans Restricted Stock and Deferred Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 28, 2017
Apr. 27, 2016
Jan. 26, 2016
Dec. 31, 2016
Restricted Stock and Deferred Restricted Stock [Member]        
Restricted and Deferred Restricted Stock Awards Outstanding [Roll Forward]        
Outstanding as of January 1, 2016, units       209,237
Issued, units       40,398
Exercised, units       (55,919)
Forfeited or expired       (996)
Outstanding as of December 31, 2016, units       192,720
Shares vested as of December 31, 2016, shares       106,817
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       $ 21.49
Issued, wtd avg grant date fair value       29.83
Exercised, wtd avg grant date fair value       26.92
Forfeited or expired, wtd avg grant date fair value       27.86
Outstanding as od December 31, 2016, wtd avg grant date fair value       21.69
Shares vested as of December 31, 2016, wtd avg grant date fair value       $ 16.62
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       93,544
Granted, units       40,398
Vested, units       (47,043)
Forfeited, units       (996)
Nonvested as of December 31, 2016, units       85,903
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       $ 27.63
Granted, wtd avg grant date fair value       29.65
Vested, wtd avg grant date fair value       28.71
Forfeited, wtd avg grant date fair value       27.86
Nonvested as of December 31, 2016, wtd avg grant date fair value       $ 28.00
Unrecognized compensation cost       $ 902
Period for recognition of compensation cost       7 months 6 days
Executive Officers [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     12,473  
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, wtd avg grant date fair value     $ 29.46  
Executive Officers [Member] | Minimum [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     0.00%  
Executive Officers [Member] | Maximum [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     150.00%  
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   7,656    
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, wtd avg grant date fair value   $ 35.79    
Scenario, Forecast [Member] | Executive Officers [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 150.00%