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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 15, 2020
Sep. 28, 2020
May 22, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated compensation expense       $ 2,146 $ 2,601 $ 1,822  
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of units (in shares)       536 497 441 420
Unamortized cost       $ 2,600      
Unamortized cost, period of recognition       2 years 2 months 12 days      
Weighted average period for recognition       1 year 7 months 6 days      
Allocated compensation expense       $ 3,006 $ 2,903 $ 2,739  
Shares forfeited (in shares)       10 7 7  
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of units (in shares)       448 420 316 381
Unamortized cost       $ 2,100      
Unamortized cost, period of recognition       2 years      
Weighted average period for recognition       1 year 6 months      
Award service period       3 years      
Shares forfeited (in shares)       197 119 262  
Performance Shares | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance target       0.00%      
Performance Shares | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance target       200.00%      
Director | Non-Employee Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of units (in shares) 5 9 18        
Fair value of units $ 22 $ 23 $ 48        
Executive Officer | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated compensation expense           $ 640  
Executive Officer | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated compensation expense           $ 1,600  
Equity Incentive Plan 2013              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized to grant (in shares)       3,300      
Shares available for future issuance (in shares)       748