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Stock-Based Compensation Stock Option Black Scholes Option Pricing Model Assumptions (Details) (Employee Stock Option [Member])
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Employee Stock Option [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]    
Dividend yield0.00%0.00%[1]0.00%0.00%
Expected volatility45.80%0.00%[1]46.40%48.70%
Risk free interest rate0.90%0.00%[1]1.70%2.30%
Expected life (years)4.910[1]4.864.6
[1]There were no employee stock options granted for the three months ended September 30, 2010.