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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expense related to unvested awards, amount $ 2.1  
Unrecognized stock-based compensation expense related to unvested awards, weighted-average period of recognition 2 years 1 day  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common shares authorized under the 2006 Equity Plan 800,000  
Awards expiration period 10 years  
Stock Options | Employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period 3 years  
Stock Options | Non-employee directors    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period 6 months  
SARs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards expiration period 10 years  
Awards vesting period 3 years  
Restricted Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total intrinsic value of awards released in period $ 0.7 $ 1.7
Restricted Shares | Employees | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards expiration period 1 year  
Restricted Shares | Employees | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards expiration period 3 years  
Restricted Shares | Non-employee directors    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards expiration period 6 months  
2006 Equity Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized under 2006 Equity Plan 1,081,260  
Performance-Based Vesting | Restricted Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awarded 35,500  
Time-Based Vesting | Restricted Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awarded 17,500