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Acquisitions Business Combinations Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
store
Mar. 31, 2017
USD ($)
Entity Location [Line Items]    
Number of acquisitions | store 4  
Purchase price | $ $ 15,500  
Payments to Acquire Businesses, Net of Cash Acquired | $ 13,364 $ 854
Business Combination, Consideration Transferred, Liabilities Incurred | $ $ 2,100  
U.S. Acquisition    
Entity Location [Line Items]    
Number of stores acquired | store 3  
Mexico Acquisition | Latin America Acquisition    
Entity Location [Line Items]    
Number of stores acquired | store 126