Basis Of Presentation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (15,471)	$ 25,559	$ (23,076)
Foreign Currency Transaction Gain (Loss), Realized	(2,300)	(5,800)	(700)
Advertising Expense	$ 149,700	$ 143,300	$ 96,800
Minimum [Member]
Property, Plant and Equipment, Useful Life	1 year
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life	10 years
Finite-Lived Intangible Asset, Useful Life	20 years
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	1 year
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	5 years