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Stock-Based Compensation Valuation Assumptions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation related to stock plans $ 2.4 $ 2.1 $ 4.5 $ 4.2
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     57.50% 69.20%
Expected dividend yield     0.00% 0.00%
Risk-free interest rate     1.50% 0.90%
Expected life of options     5 years 5 years
Weighted average fair value of options and SSARs granted     $ 9.03 $ 11.68