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Net Income Per Share (Tables)
9 Months Ended
Sep. 30, 2011
Notes To Financial Statements [Abstract] 
Net Income Per Share
The following table sets forth the computation of Net Income (Loss) Per Share for the three-month and nine-month periods ended September 30, 2011 and 2010 (in thousands, except per share data).  For the three-month period ending September 30, 2010, the same number of shares was used in the calculation of both basic and diluted earnings per share as a result of the net loss during the period.

   
Three Months Ended
 
Nine Months Ended
   
September 30,
 
September 30,
   
2011
 
2010
 
2011
 
2010
Numerator for Basic and Diluted Earnings Per Share -
               
 
Net Income (Loss)
$
540,878
$
(70,906)
$
970,425
$
106,981
                 
Denominator for Basic Earnings Per Share -
               
 
Weighted Average Shares
 
266,053
 
251,015 
 
261,664
 
250,719
Potential Dilutive Common Shares -
               
 
Stock Options/SARs
 
1,479
 
 
1,759
 
2,059
 
Restricted Stock and Restricted Stock Units
 
1,760
 
 
1,822
 
1,666
Denominator for Diluted Earnings Per Share -
               
 
Adjusted Diluted Weighted Average Shares
 
269,292
 
251,015 
 
265,245
 
254,444
                 
Net Income (Loss) Per Share
               
 
Basic
$
2.03
$
(0.28)
$
3.71
$
0.43
 
Diluted
$
2.01
$
(0.28)
$
3.66
$
0.42