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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award      
Expense incurred for stock-based compensation plans (in dollars) $ 8,283 $ 7,491  
Expense incurred for stock-based compensation plans, net of tax (in dollars) 6,031 5,353  
Restricted Shares
     
Weighted Average Fair Value at Grant Date      
Weighted average expected amortization period 1 month 24 days    
Number of restricted shares issued 17,045    
Weighted-average grant date fair value of restricted shares (in dollars per share) $ 53.78    
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars) 148    
Stock Options
     
Stock option activity      
Options outstanding at the beginning of the period (in shares) 13,446,719    
Options exercised (in shares) (1,043,444)    
Options forfeited (in shares) (58,500)    
Options outstanding at the end of the period (in shares) 12,344,775   13,446,719
Vested and non-vested expected to vest at the end of the period (in shares) 11,297,092    
Exercisable at the end of the period (in shares) 4,460,718    
Weighted Average Exercise Price      
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) $ 43.39    
Weighted average exercise price, options exercised (in dollars per share) $ 31.30    
Weighted average exercise price, options forfeited (in dollars per share) $ 50.58    
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) $ 44.37   $ 43.39
Weighted average exercise price, vested and non-vested expected to vest (in dollars per share) $ 44.09    
Weighted average exercise price, exercisable (in dollars per share) $ 38.38    
Weighted Average Remaining Contractual Term      
Weighted average remaining contractual term of options outstanding 7 years 22 days   7 years 29 days
Weighted average remaining contractual term of options vested and non-vested expected to vest 6 years 11 months 23 days    
Weighted average remaining contractual term of options exercisable 5 years 7 months 2 days    
Aggregate Intrinsic Value      
Aggregate intrinsic value of options outstanding (in dollars) 373,596   268,596
Aggregate intrinsic value of options, vested and non-vested expected to vest (in dollars) 345,248    
Aggregate intrinsic value of options exercisable (in dollars) 161,774    
Status of the Company's non-vested options and changes during the year      
Non-vested options at the beginning of the period (in shares) 7,951,177    
Non-vested options, options vested (in shares) (8,620)    
Non-vested options, options forfeited (in shares) (58,500)    
Non-vested options at the end of the period (in shares) 7,884,057   7,951,177
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) $ 13.36    
Weighted average fair value at grant date, options vested (in dollars per share) $ 15.62    
Weighted average fair value at grant date, options forfeited (in dollars per share) $ 13.50    
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) $ 13.35   $ 13.36
Total intrinsic value of stock options exercised (in dollars) 40,542 24,819  
Total fair value of stock options vested (in dollars) 135 119  
Total compensation cost related to non-vested options not yet recognized (in dollars) $ 68,292    
Weighted average expected amortization period 3 years 29 days    
2009 Option Plan
     
Share-based Compensation Arrangement by Share-based Payment Award      
Shares available for the granting of additional stock options 5,026,370    
2000 Option Plan and 2009 Option Plan
     
Share-based Compensation Arrangement by Share-based Payment Award      
Options ratable vesting period 5 years    
Options exercisable period 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    
Options ratable vesting period 3 years    
Options exercisable period 10 years    
Number of additional options expected to be granted 0    
Directors Restricted Stock Plan
     
Share-based Compensation Arrangement by Share-based Payment Award      
Shares available for the granting of additional stock options 107,955    
2000 Option Plan
     
Share-based Compensation Arrangement by Share-based Payment Award      
Number of additional options that can be granted 0