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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash associated with undistributed earnings of foreign subsidiaries   $ 28,300    
Asset Impairment Charges $ 1,500 10,505 $ 0 $ 0
U.S. federal statutory rate       21.00%
Advertising expense   1,100 1,200 $ 1,400
(Gain) loss on foreign exchange   (884) 787 (762)
Purchases of store real property   $ 45,502 $ 74,661 $ 19,996
Mexico, Pesos        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Foreign currency exchange rate, translation 1920.00% 2150.00% 1930.00% 1920.00%
United States of America, Dollars        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Foreign currency exchange rate, translation 100.00% 100.00% 100.00% 100.00%
Guatemala, Quetzales        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Foreign currency exchange rate, translation 750.00% 770.00% 770.00% 750.00%
Colombia, Pesos        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Foreign currency exchange rate, translation 295600.00% 369300.00% 328000.00% 295600.00%
Buildings | Minimum        
Property, Plant and Equipment [Line Items]        
Property and equipment useful life (years)   30 years    
Buildings | Maximum        
Property, Plant and Equipment [Line Items]        
Property and equipment useful life (years)   40 years    
Equipment | Minimum        
Property, Plant and Equipment [Line Items]        
Property and equipment useful life (years)   3 years    
Equipment | Maximum        
Property, Plant and Equipment [Line Items]        
Property and equipment useful life (years)   5 years    
United States        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Asset Impairment Charges   $ 0    
U.S. federal statutory rate   21.00% 21.00%  
(Gain) loss on foreign exchange   $ 0 $ 0 $ 0