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Benefits Plans (Tables)
6 Months Ended
Jun. 30, 2011
Benefits Plans [Abstract]  
Fair value of options granted to employees
          The following table summarizes the weighted-average assumptions used to compute the fair value of options granted to employees and members of our board of directors:
                                 
    For the Three Months   For the Six Months
    Ended June 30,   Ended June 30,
    2011   2010   2011   2010
Risk-free interest rate
    1.8 %     2.2 %     1.8 %     2.5 %
Expected life of options — years
    5.25       5.11       5.25       5.06  
Expected stock price volatility
    56 %     86 %     56 %     85 %
Expected dividend yield
    0 %     0 %     0 %     0 %
Stock options activity under share based payment plans
          The following table summarizes stock option activity under our share-based payment plans for the six months ended June 30, 2011 (shares in thousands):
                                 
                    Weighted-Average    
                    Remaining   Aggregate
            Weighted-Average   Contractual Term   Intrinsic
    Shares   Exercise Price   (Years)   Value
Outstanding, December 31, 2010
    401,870     $ 1.32                  
Granted
    719     $ 2.33                  
Exercised
    (7,346 )   $ 0.94                  
Forfeited, cancelled or expired
    (17,613 )   $ 4.30                  
 
                               
Outstanding, June 30, 2011
    377,630     $ 1.19       6.14     $ 495,613  
 
                               
Exercisable, June 30, 2011
    113,277     $ 2.42       4.67     $ 90,035  
 
                               
Summary of nonvested restricted stock and restricted stock unit activity
          The following table summarizes the nonvested restricted stock and restricted stock unit activity under our share-based payment plans for the six months ended June 30, 2011 (shares in thousands):
                 
            Weighted-Average
            Grant Date
    Shares   Fair Value
Nonvested, December 31, 2010
    2,397     $ 2.57  
Granted
        $  
Vested restricted stock awards
    (1,854 )   $ 3.30  
Vested restricted stock units
    (101 )   $ 3.08  
Forfeited
    (21 )   $ 3.05  
 
               
Nonvested, June 30, 2011
    421     $ 1.46