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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Table) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Website
shares
Dec. 31, 2017
USD ($)
Website
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Investment [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares 5,135,000 5,874,000 6,287,000 6,083,000
Number of Stores 229 206    
Available-for-sale Securities, Gross Realized Gain (Loss) $ (189) $ 5 $ (661)  
Translation Adjustment Functional to Reporting Currency, Net of Tax (33,091) (24,798)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 530 (623)    
Unrealized Gain (Loss) on Investments (67) (192)    
Accumulated other comprehensive loss $ (32,628) $ (25,613) $ (31,751) $ (31,413)
Number of E-Commerce Websites | Website 7 4    
Investment Maturity Date Range One Year Or Less [Member]        
Investment [Line Items]        
Financial Instruments, Owned, Corporate Debt, at Fair Value $ 24,617 $ 11,979    
Certificates of Deposit, at Carrying Value 42,351 52,048    
Marketable Securities 66,968 64,027    
Investment Maturity Date Range One To Eight Years [Member]        
Investment [Line Items]        
Financial Instruments, Owned, Corporate Debt, at Fair Value 0 29,523    
Certificates of Deposit, at Carrying Value 0 0    
Marketable Securities $ 0 29,523    
Other Long-term Investments [Member]        
Investment [Line Items]        
Available-for-sale Securities, Gross Unrealized Gain   $ 90