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Share-Based Compensation Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 02, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 3.9 $ 3.7 $ 3.0  
2007 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Contractual term 10 years      
Number of shares authorized (in shares)       17,000,000
Number of shares available for grant (in shares) 11,500,000      
Employee stock option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Unrecognized compensation expense from Restricted Stock $ 2.8      
Weighted-average period of recognition of unrecognized compensation expense 1 year 11 months      
Employee stock option [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Employee stock option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Restricted shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense from Restricted Stock $ 1.4      
Weighted-average period of recognition of unrecognized compensation expense 1 year 2 months 6 days      
Award vesting period 4 years      
Restricted shares vesting percentage 25.00%      
Restricted shares [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares vesting percentage 100.00%      
Director [Member] | Restricted shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year