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Acquisitions - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
store
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Entity Location [Line Items]      
Goodwill $ 906,322 $ 834,883 $ 831,145
Purchase price 105,000    
Payments to Acquire Businesses, Net of Cash Acquired 88,387 $ 1,141  
Business Combination, Consideration Transferred, Liabilities Incurred 16,600    
Revenue since acquisition 21,000    
Transaction and integration costs 3,600    
Net earnings since acquisition 1,900    
Latin America Acquisition      
Entity Location [Line Items]      
Goodwill $ 65,785    
Number of stores acquired | store 342    
Number of acquisitions | store 4    
U.S. Acquisition      
Entity Location [Line Items]      
Goodwill $ 5,172    
Number of stores acquired | store 18    
Number of acquisitions | store 7