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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
year
Mar. 31, 2012
year
Jun. 30, 2011
Jun. 30, 2012
year
Jun. 30, 2011
Dec. 31, 2011
year
Weighted Average Fair Value at Grant Date            
Expense incurred for stock-based compensation plans (in dollars) $ 7,610   $ 7,061 $ 15,101 $ 13,381  
Expense incurred for stock-based compensation plans, net of tax (in dollars) 5,498   5,116 10,851 9,611  
2009 Option Plan
           
Share-based Compensation Arrangement by Share-based Payment Award            
Shares available for the granting of additional stock options 4,888,490     4,888,490    
2000 Option Plan and 2009 Option Plan
           
Share-based Compensation Arrangement by Share-based Payment Award            
Options ratable vesting period (in years)       5 years    
Options exercisable period (in years)       10 years    
Directors Option Plan
           
Share-based Compensation Arrangement by Share-based Payment Award            
Shares available for the granting of additional stock options 70,000     70,000    
Options ratable vesting period (in years)       3 years    
Options exercisable period (in years)       10 years    
Restricted Stock Plan
           
Weighted Average Fair Value at Grant Date            
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars) 786     786    
Weighted average expected amortization period (in years)       0.90    
Number of restricted shares issued       16,429    
Weighted-average grant date fair value of restricted shares       $ 53.26    
Restricted Stock Plan | Maximum
           
Share-based Compensation Arrangement by Share-based Payment Award            
Shares available for the granting of additional restricted shares 108,571     108,571    
Stock Options
           
Stock option activity            
Options outstanding at the beginning of the period (in shares) 13,040,440 14,016,900   14,016,900    
Options granted (in shares) 2,954,000          
Options exercised (in shares) (511,270) (853,460)        
Options forfeited (in shares) (58,540) (123,000)        
Options outstanding at the end of the period (in shares) 15,424,630 13,040,440   15,424,630    
Vested and non-vested expected to vest at the end of the period (in shares) 14,211,300     14,211,300    
Exercisable at the end of the period (in shares) 7,376,767     7,376,767    
Weighted Average Exercise Price            
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) $ 38.77 $ 38.00   $ 38.00    
Weighted average exercise price, options granted (in dollars per share) $ 53.26     $ 53.26    
Weighted average exercise price, options exercised (in dollars per share) $ 25.99 $ 26.23   $ 25.99    
Weighted average exercise price, options forfeited (in dollars per share) $ 43.47 $ 38.53   $ 43.47    
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) $ 41.95 $ 38.77   $ 41.95    
Weighted average exercise price, vested and non-vested expected to vest (in dollars per share) $ 41.44     $ 41.44    
Weighted average exercise price, exercisable (in dollars per share) $ 35.64     $ 35.64    
Weighted Average Remaining Contractual Term            
Weighted average remaining contractual term of options outstanding (in years) 7.26 6.79   7.26   6.89
Weighted average remaining contractual term of options vested and non-vested expected to vest (in years)       7.14    
Weighted average remaining contractual term of options exercisable (in years)       5.77    
Aggregate Intrinsic Value            
Aggregate intrinsic value of options outstanding (in dollars) 200,023 273,830   200,023   125,067
Aggregate intrinsic value of options, vested and non-vested expected to vest (in dollars) 191,524     191,524    
Aggregate intrinsic value of options exercisable (in dollars) 142,205     142,205    
Status of the Company's non-vested options and changes during the year            
Non-vested options at the beginning of the period (in shares) 7,506,576 7,636,576   7,636,576    
Non-vested options, options granted (in shares) 2,954,000          
Non-vested options, options vested (in shares) (2,354,173) (7,000)        
Non-vested options, options forfeited (in shares) (58,540) (123,000)        
Non-vested options at the end of the period (in shares) 8,047,863 7,506,576   8,047,863    
Weighted Average Fair Value at Grant Date            
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) $ 13.43 $ 13.41   $ 13.41    
Weighted average fair value at grant date, options granted (in dollars per share) $ 12.94          
Weighted average fair value at grant date, options vested (in dollars per share) $ 13.07 $ 16.98        
Weighted average fair value at grant date, options forfeited (in dollars per share) $ 13.51 $ 12.52        
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) $ 13.35 $ 13.43   $ 13.35    
Total intrinsic value of stock options exercised (in dollars) 16,118   6,739 40,937 26,402  
Total fair value of stock options vested (in dollars) 30,763   28,446 30,882 28,446  
Total compensation cost related to non-vested options not yet recognized (in dollars) $ 91,905     $ 91,905    
Weighted average expected amortization period (in years)       3.59