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Shareholders' Equity Textuals (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]      
Cross Currency Swap interest portion recognized in income $ (200)    
Common Stock, Shares Authorized 125,000,000 125,000,000  
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01  
Common Stock, Voting Rights one    
Common Stock Reserved for Issuance to the Stock Option Plans 3,436,176    
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 $ 583,400    
Shares Repurchased Under Share Repurchase Program 26,700,000    
Share Repurchase Program, Total Cost Program to Date $ 3,900,000    
Repurchases of Common Stock, Value $ (399,997) $ (499,992) $ (494,966)
Repurchases of Common Stock, Shares (749,254) (1,348,507)  
Treasury Stock Acquired, Average Cost Per Share $ 533.84 $ 370.75  
Exercise of stock options and restricted stock units, shares 270,413 278,623  
Cross Currency Swap Revaluation Portion Recognized in Earnings $ (1,200)