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Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($)
 4 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Franchise rights impairment   $ 0 $ 15,400,000 $ 0
Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill impairment   0 0  
Impairment of long-lived assets for sale   $ 12,800,000 $ 3,800,000  
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  
Franchise Rights [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Franchise rights impairment $ 0 $ 0    
Franchise Rights [Member] | Nonrecurring [Member] | Volkswagen [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Franchise rights impairment   0 $ 15,400,000  
Continuing Operations [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of long-lived assets held and used   1,900,000 3,100,000  
Impairment of long-lived assets for sale   12,100,000 3,000,000  
Discontinued Operations, Held-for-sale [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of long-lived assets for sale   700,000 800,000  
Reported Value Measurement [Member] | Continuing Operations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-lived assets held for sale   41,400,000 47,100,000  
Reported Value Measurement [Member] | Discontinued Operations, Held-for-sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-lived assets held for sale   $ 15,700,000 $ 22,300,000