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Shareholders' Equity (Tables)
6 Months Ended
Jun. 30, 2012
Shareholders' Equity [Abstract]  
Summary of changes in shareholders' equity
                                                         
          Additional                 Deferred     Deferred        
    Common     Paid-In-     Retained     Treasury     Comp.     Comp.        
    Stock     Capital     Earnings     Stock     Trust     Liability     Total  

Balance, December 31, 2011

  $ 206     $ 1,072,779     $ 4,158,492     $ (3,856,678   $ (25,581   $ 25,581     $ 1,374,799  
               

Net income

    —         —         66,961       —         —         —         66,961  

Deferred compensation activity

    —         —         —         —         250       (250     —    

Equity-based compensation

    —         33,173       —         —         —         —         33,173  

Tax benefit from equity benefit plan activity

    —         4,709       —         —         —         —         4,709  

Proceeds from stock options exercised

    —         42,182       —         —         —         —         42,182  

Treasury stock issued upon option exercise and restricted share vesting

    —         (39,725     —         39,725       —         —         —    
   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Balance, June 30, 2012

  $ 206     $ 1,113,118     $ 4,225,453     $ (3,816,953   $ (25,331   $ 25,331     $ 1,521,824