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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended
May 12, 2014
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation, Aggregate Disclosures:      
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan   5,000,000  
Share-based compensation costs charged against income   $ 1.9 $ 1.2
Tax benefit recognized from share-based compensation expense   0.7 0.5
Options, Additional Disclosures:      
Options granted, weighted-average grant-date fair value (in USD per share)   $ 15.93 $ 13.94
Options exercised, aggregate intrinsic value   1.9  
Unrecognized compensation costs related to nonvested awards   8.7  
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition   1 year 1 month  
Total fair value of vested shares   4.7 1.9
Cash received from exercise of stock options   1.3 0.3
Tax benefit realized from exercise of stock options   $ 1.0 $ 0.5
Shares available for issuance under the Plan   1,200,000  
Restricted Shares
     
Restricted Shares      
Award vesting period 3 years    
Granted in period 96,638    
Granted, weighted-average grant-date fair value (in USD per share)   $ 33.50 $ 29.94
Options, Additional Disclosures:      
Percentage of options vesting annually 33.30%    
Restricted Shares | Minimum
     
Restricted Shares      
Award vesting period   3 years  
Restricted Shares | Maximum
     
Restricted Shares      
Award vesting period   5 years  
Stock Options | Minimum
     
Restricted Shares      
Award vesting period   3 years  
Stock Options | Maximum
     
Restricted Shares      
Award vesting period   5 years  
Options, Additional Disclosures:      
Award exercisability period, from date of grant   10 years  
Employee | Restricted Shares
     
Restricted Shares      
Award vesting period   3 years  
Employee | Stock Options
     
Restricted Shares      
Award vesting period 3 years    
Options, Additional Disclosures:      
Award exercisability period, from date of grant 10 years    
Options granted in period 307,490    
Percentage of options vesting annually 33.30%    
Options granted, weighted-average grant-date fair value (in USD per share) $ 33.50    
Director | Restricted Shares
     
Restricted Shares      
Award vesting period   1 year  
Group One | Restricted Shares
     
Restricted Shares      
Granted in period 75,638    
Group Two | Restricted Shares
     
Restricted Shares      
Granted in period 21,000