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Financial Instruments And Fair Value Measurements (Narrative) (Details) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Franchise rights impairment $ 0 $ 0
Goodwill [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Date of Annual Goodwill and Indefinite Lived Intangible Assets Impairment Test April 30 April 30
Franchise Rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Date of Annual Goodwill and Indefinite Lived Intangible Assets Impairment Test April 30 April 30