Intangible Assets (Schedule Of Estimated Useful Lives) (Details)	6 Months Ended
	Jun. 30, 2018
Trademarks And Tradenames [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	2 years
Trademarks And Tradenames [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	8 years