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Stock-Based Compensation (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock-Based Compensation        
Stock-based compensation expense (in dollars) $ 3.2 $ 2.5 $ 10.7 $ 10.8
2013 Omnibus Plan [Member]        
Stock-Based Compensation        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 8,000   8,000  
Stock Options        
Stock-Based Compensation        
Number of share options granted during the period (in shares)     700 300
Restricted Stock Units (RSUs) [Member]        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares)     500 100
Officers and Employees [Member] | Restricted Stock        
Stock-Based Compensation        
Expiration period of restrictions (in years)     third anniversary  
Director [Member] | Restricted Stock        
Stock-Based Compensation        
Expiration period of restrictions (in years)     second anniversary