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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
plan
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 1.1 $ 1.9 $ 4.1 $ 5.1
Number of share-based compensation plans     5  
Stock Incentive Plan 2011
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant 1,969,692   1,969,692  
Stock Appreciation Rights (SARs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (shares)     600,000  
Non-option equity instruments outstanding, number of shares 3,100,000   3,100,000