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Stock Based Compensation (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Notes to Financial Statements [Abstract]    
Percentage of eligible earnings to purchase common stock through the employee stock purchase plan 10.00%  
Discount on the average closing price for the employee stock purchase plan 5.00%  
Stock Based Compensation Expense Table    
Stock based compensation $ 14,571,000 $ 12,977,000
Tax effect recognized in net income 5,100,000 4,542,000
Windfall tax benefit/(shortfall), net 7,485,000 4,312,000
Employee stock options granted during the period 533,000 447,850
Fair value per share ($) $ 35.14 $ 36.53
Weighted average assumptions used to value option grants Table    
Risk-free interest rate (%) 1.62% 0.80%
Expected option life (years) 5 years 2 months 26 days 5 years 2 months 5 days
Expected volatility (%) 27.62% 36.29%
Expected dividend yield (%) 0.59% 0.57%
Cash received from exercise of options 10,000,000 9,600,000
Restricted stock awards granted during period 237,001 261,390
Weighted average fair value per share of restricted stock awards granted during the period $ 139.62 $ 115.36
Restricted stock awards vested during period 32,161  
Weighted average grant date fair value per share $ 79.06  
Weighted average vest date fair value per share $ 140.42  
Shares of stock purchased during the period by participants in the employee stock purchase plan 5,664 5,594
Amount paid for stock purchased during the period by participants in the employee stock purchase plan $ 730,000 $ 640,000