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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Table) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Website
shares
Dec. 31, 2019
USD ($)
Website
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Investment [Line Items]        
Short-term investments $ 39,302 $ 40,521    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares 3,651,000 4,427,000 5,137,000 5,876,000
Number of Stores 218 227    
Available-for-sale Securities, Gross Realized Gain (Loss) $ 0 $ (5) $ (189)  
Translation Adjustment Functional to Reporting Currency, Net of Tax (28,421) (29,636) (33,091)  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (743) (804) 530  
Unrealized Gain (Loss) on Investments 0 0 (67)  
Accumulated other comprehensive loss $ (29,164) $ (30,440) (32,628) $ (25,613)
Number of E-Commerce Websites | Website 7 8    
Reclassification out of Accumulated Other Comprehensive Income        
Investment [Line Items]        
Accumulated other comprehensive loss $ 89 $ 15 $ 150  
Certificates of Deposit [Member]        
Investment [Line Items]        
Short-term investments $ 39,302 $ 40,521