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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock-based compensation expense related to unvested awards, amount $ 2.2     $ 2.2
Unrecognized stock-based compensation expense related to unvested awards, weighted-average period of recognition       2 years 7 days
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares authorized under the 2006 Equity Plan 800,000     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       $ 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     1,081,260
Performance-Based Vesting | Restricted Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awarded 450   107,961 108,411
Time-Based Vesting | Restricted Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awarded 4,000 5,600   9,600