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Revenue Recognition (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]            
Deferred Revenue $ 55,586,000 $ 52,620,000 $ 45,760,000 $ 40,020,000 $ 36,188,000 $ 26,157,000
Deferred Revenue, Current 23,893,000     16,045,000    
Deferred Revenue, Noncurrent $ 31,693,000     $ 23,975,000    
Transamerican Auto Parts | Tires And Other [Member] | Minimum            
Deferred Revenue Arrangement [Line Items]            
Standard Product Warranty Time Period 2 years          
Transamerican Auto Parts | Tires And Other [Member] | Maximum            
Deferred Revenue Arrangement [Line Items]            
Standard Product Warranty Time Period 5 years