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Shareholders' Equity Textuals (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 30, 2017
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 3,706,789      
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    
Share Repurchase Program and Treasury Stock [Abstract]        
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 1,000,000      
Shares Repurchased Under Share Repurchase Program 26,000,000      
Share Repurchase Program, Total Cost Program to Date $ 3,500,000      
Repurchases of Common Stock, Value $ (499,992) $ (494,966) $ (414,000)  
Repurchases of Common Stock, Shares (1,348,507) (1,556,797)    
Treasury Stock Acquired, Average Cost Per Share $ 370.75 $ 317.92    
Exercise of stock options and restricted stock units, shares 278,623 403,908