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Earnings Per Share
 6 Months Ended
Jun. 30, 2011
Earnings Per Share  
Earnings Per Share
13. EARNINGS PER SHARE
     The following table sets forth the comparison of basic and diluted earnings per share:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Basic earnings per share
                                
Net income
   $ 93,800     $ 183,959     $ 102,420     $ 317,699  
Weighted average common shares outstanding
     38,346,489       50,222,974       38,061,724       50,123,945  
 
                        
Basic earnings per share
   $ 2.45     $ 3.66     $ 2.69     $ 6.34  
 
                        
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Diluted earnings per share
                                
Net income
   $ 93,800     $ 183,959     $ 102,420     $ 317,699  
Weighted average common shares outstanding
     38,346,489       50,222,974       38,061,724       50,123,945  
Share equivalents:
                                
Warrants and options
     333,837       1,486,465       503,529       1,534,861  
Restricted stock units
     507,969       456,946       503,954       469,301  
LTIP awards
     612,458       808,025       804,211       958,601  
 
                        
Weighted average common shares and common share equivalents outstanding — diluted
     39,800,753       52,974,410       39,873,418       53,086,708  
 
                        
Diluted earnings per share
   $ 2.36     $ 3.47     $ 2.57     $ 5.98  
 
                        
     For the three months ended June 30, 2011, a weighted average of 634,579 employee stock options and 28,256 RSUs were considered anti-dilutive and were therefore excluded from the calculation of the diluted earnings per share. For the six months ended June 30, 2011, a weighted average of 568,359 employee stock options and 119,354 RSUs were considered anti-dilutive and were therefore excluded from the calculation of the diluted earnings per share.
     For the three months ended June 30, 2010, a weighted average of 686,938 employee stock options and 24,833 RSUs were considered anti-dilutive and were therefore excluded from the calculation of the diluted earnings per share. For the six months ended June 30, 2010, a weighted average of 600,567 employee stock options and 15,988 RSUs were considered anti-dilutive and were therefore excluded from the calculation of the diluted earnings per share.