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Stock-Based Compensation Valuation Assumptions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation related to stock plans $ 2.4 $ 1.8 $ 6.6 $ 6.4
Stock Appreciation Rights (SARs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 3 years      
Options and SSARs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected sock price volatility   63.60% 69.20%  
Expected dividend yield   0.00% 0.00%  
Risk-free interest rate   0.70% 0.90%  
Expected life of options   5 years 5 years  
Weighted average fair value of options and SSARs granted   $ 4.75 $ 11.68