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STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2011
STOCK-BASED COMPENSATION  
Assumptions used in the option pricing model to assess the fair values of the options granted

The following assumptions were used in the option-pricing model to assess the fair values of the options granted in the six months ended June 30, 2011:

 
  Options  

Risk free interest rate

  0.29-2.37%  

Expected option life (years)

  1.0-5.0  

Expected dividend yield

  2.87%-3.49%  

Volatility factor

  73.5-94.3%  

Weighted-average grant date fair value (per share)

  $13.14  
Summary of common stock options and equity-based incentive awards activity

 
  Common Stock Options   Equity-based
incentive awards
 
 
  Quantity   Weighted Average Exercise Price   Quantity   Weighted Average Exercise Price  

Outstanding as of December 31, 2010

    7,426,499   $ 16.78     3,192,483     14.00  
                   

Granted

    933,125     18.88     512,500     14.00  

Exercised

    (335,681 )   15.37     (213,406 )   14.00  

Forfeited

    (118,646 )   16.45     (69,688 )   14.00  

Expired

    (73,125 )   15.21          
                   

Outstanding as of June 30, 2011

    7,832,172     17.04     3,421,889     14.00  
                   
Summary of information about nonvested common stock options and equity-based incentive awards

 

 
  Common Stock Options   Equity-based
incentive awards
 
 
  Quantity   Weighted average grant-date fair value   Quantity   Weighted average grant-date fair value  

Nonvested as of December 31, 2010

    4,204,468   $ 10.97     2,276,667   $ 2.80  

Granted

    933,125     12.30     512,500     2.80  

Vested

    (1,311,940 )   11.50     (613,958 )   2.80  

Forfeited

    (118,646 )   9.91     (69,688 )   2.80  
                   

Nonvested as of June 30, 2011

    3,707,007     11.28     2,105,521     2.80