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Acquisitions Business Combinations Narrative (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
store
Jun. 30, 2017
USD ($)
Entity Location [Line Items]    
Number of acquisitions | store 7  
Purchase price $ 44,000  
Payments to Acquire Businesses, Net of Cash Acquired 36,171 $ 1,115
Business Combination, Consideration Transferred, Liabilities Incurred 7,800  
Revenue since acquisition 5,900  
Net earnings since acquisition 900  
Transaction and integration costs $ 1,300  
Latin America Acquisition    
Entity Location [Line Items]    
Number of stores acquired | store 188  
U.S. Acquisition    
Entity Location [Line Items]    
Number of stores acquired | store 18