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Shareholders' Equity Textuals (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]      
Common Stock, Shares Authorized 125,000,000 125,000,000  
Common Stock, Par Value $ 0.01 $ 0.01  
Common Stock, Voting Rights one    
Common Stock Reserved for Issuance to the Stock Option Plans 4,762,751    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]      
Preferred Stock, Shares Authorized 10,000,000 10,000,000  
Preferred Stock, Par Value $ 0.01 $ 0.01  
Restricted Stock Units (RSUs) [Abstract]      
Restricted Stock Units, Grants in Period 29,507 43,078  
Restricted Stock Units, Grants in Period, Weighted Average Grant Date Fair Value $ 244.90 $ 169.37  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Restricted Stock Units, Intrinsic Value $ 7,200,000 $ 7,300,000  
Share-based Compensation Expense for Restricted Stock Units $ 5,500,000 $ 5,300,000  
Share Repurchase Program and Treasury Stock [Abstract]      
Stock Repurchase Program, Authorized Amount 3,000,000,000    
Stock Repurchase Program, Additional Authorized Amount 750,000,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 892,000,000    
Shares Repurchased Under Share Repurchase Program 21,500,000    
Repurchases of Common Stock, Value $ (294,976,000) $ (278,672,000) $ (204,578,000)
Repurchases of Common Stock, Shares (1,321,577) (1,637,827)  
Treasury Stock Acquired, Average Cost Per Share $ 223.18 $ 170.13  
Exercise of stock options and restricted stock units, shares 398,646 457,732