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Stock-Based Compensation (Narrative) (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares authorized under 2006 Equity Plan 1,081,260
Common shares authorized under the 2006 Equity Plan 800,000
Unrecognized stock-based compensation expense related to unvested awards, amount $ 1,400,000
Unrecognized stock-based compensation expense related to unvested awards, weighted-average period of recognition 1 year 6 months 1 day
Stock Options
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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 $ 369,000
Restricted Shares | Employees | Minimum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards expiration period 1 year
Restricted Shares | Employees | Maximum [Member]
 
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