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Stock-Based Compensation Valuation Assumptions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 2.7 $ 3.5
Options and Ssars [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected stock price volatility 63.30% 64.20%
Expected dividend yield 0.00% 0.00%
Risk-free interest rate 0.70% 2.10%
Expected life of options 5 5
Weighted average fair value of options and SSARs granted $ 4.68 $ 5.68
Chief Executive Officer [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1.0 $ 2.0