Business Acquisitions (Schedule Of Assets Acquired Amortized Over Estimated Useful Lives) (Details) - Germany, Switzerland, And Austria Licensee [Member] $ in Thousands	Dec. 05, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 741
Reacquisition Of License [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 360
Reacquisition Of License [Member] | Weighted Average [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Localized Content [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 202
Localized Content [Member] | Weighted Average [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 179
Customer Relationships [Member] | Weighted Average [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years