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Revenue Recognition (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]            
Deferred Revenue $ 52,620,000 $ 49,345,000 $ 45,760,000 $ 36,188,000 $ 30,445,000 $ 26,157,000
Deferred Revenue, Current 22,265,000     14,678,000    
Deferred Revenue, Noncurrent $ 30,355,000     $ 21,510,000    
Transamerican Auto Parts [Member] | Tires And Other [Member] | Minimum            
Deferred Revenue Arrangement [Line Items]            
Standard Product Warranty Time Period 2 years          
Transamerican Auto Parts [Member] | Tires And Other [Member] | Maximum            
Deferred Revenue Arrangement [Line Items]            
Standard Product Warranty Time Period 5 years