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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Table) (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Investment [Line Items]        
Number of Stores 189 169    
Available-for-sale Securities, Gross Realized Gain (Loss) $ (661,000) $ 67,000 $ 677,000  
Translation Adjustment Functional to Reporting Currency, Net of Tax (31,634,000) (29,487,000)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 191,000 (315,000)    
Unrealized Gain (Loss) on Investments (308,000) (1,611,000)    
Accumulated other comprehensive loss (31,751,000) (31,413,000) $ (12,752,000) $ (6,677,000)
Available-for-sale Securities, Gross Unrealized Gain 279,000      
Available-for-sale Securities, Gross Realized Gains 89,000 530,000    
Investment Maturity Date Range One Year Or Less [Member]        
Investment [Line Items]        
Financial Instruments, Owned, Corporate Debt, at Fair Value 11,527,000 11,240,000    
Certificates of Deposit, at Carrying Value 27,968,000 21,184,000    
Marketable Securities 39,495,000 32,424,000    
Investment Maturity Date Range One To Eight Years [Member]        
Investment [Line Items]        
Financial Instruments, Owned, Corporate Debt, at Fair Value 70,559,000 88,465,000    
Certificates of Deposit, at Carrying Value 0 0    
Marketable Securities 70,559,000 88,465,000    
Other Long-term Investments [Member]        
Investment [Line Items]        
Available-for-sale Securities, Gross Unrealized Gain $ 118,000 1,133,000    
Available-for-sale Securities, Gross Realized Gains   $ 52,000