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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 03, 2019
Mar. 01, 2019
Jun. 01, 2018
Mar. 01, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             1 year 10 months 24 days  
Shares Reserved (in shares)         2,705,000   2,705,000  
Shares Available to Issue (in shares)         1,906,000   1,906,000  
Options Outstanding (in shares)         1,097,000   1,097,000  
Performance Awards Outstanding (in shares)         497,000   497,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         $ 1,800   $ 1,800  
Directors compensation expense         $ 114 $ 118 $ 228 $ 202
Treasury stock acquired, shares             400,000  
Treasury Stock, Value             $ 7,756 $ 0
Treasury Stock Acquired, Average Cost Per Share             $ 19.39  
Dividends declared per common share (in dollars per Share) $ 0.075 $ 0.075 $ 0.075 $ 0.075 $ 0.075 $ 0.075 $ 0.15 $ 0.15
Dividends $ 1,400 $ 1,400 $ 1,400 $ 1,200        
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage         200.00%   200.00%  
Stock Repurchase Program, Remaining Authorized Repurchase Amount         $ 600   $ 600  
ESPP                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense         61 $ 53 166 $ 150
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense         211 220 $ 428 465
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             20.00%  
Share-based compensation expense         149 236 $ 353 716
Officers And Key Employees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Directors compensation expense         $ 58 $ 344 $ 77 $ 620
Amended And Restated 2006 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares Reserved (in shares)         0   0  
Shares Available to Issue (in shares)         0   0  
Options Outstanding (in shares)         945,000   945,000  
Performance Awards Outstanding (in shares)         0   0  
Cancelled shares (in shares)             1,150,000  
2017 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares Reserved (in shares)         2,705,000   2,705,000  
Shares Available to Issue (in shares)         1,906,000   1,906,000  
Options Outstanding (in shares)         152,000   152,000  
Performance Awards Outstanding (in shares)         497,000   497,000