Shareholders' Equity Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Cross Currency Swap interest portion recognized in income	$ 13,800	$ 3,600	$ 800
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	2,797,351
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
Stock Repurchase Program, Additional Authorized Amount		$ 2,500,000
Share Repurchase Program and Treasury Stock [Abstract]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 3,100,000
Shares Repurchased Under Share Repurchase Program	29,400,000
Share Repurchase Program, Total Cost Program to Date	$ 5,900,000
Repurchases of Common Stock, Value	$ (774,998)	$ (774,999)	$ (474,999)
Repurchases of Common Stock, Shares	(815,652)	(1,094,648)	(802,809)
Treasury Stock Acquired, Average Cost Per Share	$ 950.14	$ 707.97	$ 591.65
Exercise of stock options and restricted stock units, shares	162,176	298,002	183,379
Cross Currency Swap Revaluation Portion Recognized in Earnings	$ 2,300	$ 4,600	$ 3,000