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Shareholders' Equity Textuals (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 29, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]        
Common Stock, Shares Authorized 125,000,000 125,000,000    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01   $ 0.01
Common Stock, Voting Rights one      
Common Stock Reserved for Issuance to the Stock Option Plans 3,985,412      
Share Repurchase Program and Treasury Stock [Abstract]        
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 1,500,000      
Stock Repurchase Program, Additional Authorized Amount $ 1,500,000      
Shares Repurchased Under Share Repurchase Program 24,600,000      
Share Repurchase Program, Total Cost Program to Date $ 3,000,000      
Repurchases of Common Stock, Value $ (494,966) $ (414,000) $ (294,976)  
Repurchases of Common Stock, Shares (1,556,797) (1,617,499)    
Treasury Stock Acquired, Average Cost Per Share $ 317.92 $ 255.93    
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