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Equity Compensation Plans and Equity (Tables)
12 Months Ended
Dec. 31, 2011
Equity Compensation Plans and Equity  
Schedule of equity-based compensation expense
 
  Years ended December 31,  
 
  2011   2010   2009  

Equity-based compensation expense

  $ 12,807   $ 8,769   $ 7,113  
Assumptions based on which fair value of each option granted was estimated using the Black-Scholes option-pricing model
 
  Year ended December 31,  
 
  2011   2010   2009  

Weighted-average expected stock-price volatility

    55%     62%     65%  

Weighted-average expected option life

    4 years     5 years     4 years  

Average risk-free interest rate

    1.40%     1.92%     1.79%  

Average dividend yield

    0%     0%     0%  
Summary of restricted stock awards and restricted stock unit activity
 
  Shares (000's)   Weighted-
Average
Grant-Date
Fair Value
 

Nonvested at December 31, 2010

    616   $ 19.06  

Granted

    304     48.91  

Vested

    (199 )   14.50  

Forfeited (including cancelled awards)

    (103 )   28.72  
             

Nonvested at December 31, 2011

    618   $ 33.61  
 
Summary of stock option awards activity
 
  Shares (000s)   Weighted-
Average
Exercise
Price
  Aggregate
Intrinsic
Value (000s)
  Weighted-
Average
Remaining
Contractual
Life
(in years)
 

Outstanding at December 31, 2010

    2,569   $ 19.71              

Granted

    404     48.11              

Exercised

    (688 )   15.57              

Forfeited (including cancelled options)

    (179 )   30.72              
                         

Outstanding at December 31, 2011

    2,106   $ 25.58   $ 8,274     6.0  
                         

Options exercisable at December 31, 2011

    983   $ 17.92   $ 4,963     4.4  
Summary of information about stock options outstanding
 
  Options Outstanding   Options Exercisable  
Range of Exercise Prices
  Number
Outstanding at
December 31, 2011
(000s)
  Weighted-
Average
Remaining
Contractual Life
(in years)
  Weighted-
Average
Exercise Price
  Number
Exercisable at
December 31, 2011
(000s)
  Weighted-
Average
Exercise Price
 

$8.82-15.08

    737     4.4   $ 10.98     412   $ 11.27  

15.29-23.55

    425     3.1     18.49     417     18.39  

24.40-39.79

    545     8.3     33.39     150     34.11  

42.19-51.70

    399     8.9     49.45     4     47.37  
                       

 

    2,106     6.0   $ 25.58     983   $ 17.92