XML 52 R37.htm IDEA: XBRL DOCUMENT v3.10.0.1
Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Table) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investment [Line Items]          
Number of Stores 206 206 189    
Available-for-sale Securities, Gross Realized Gain (Loss)   $ 5,000 $ (661,000) $ 67,000  
Translation Adjustment Functional to Reporting Currency, Net of Tax $ (24,798,000) (24,798,000) (31,634,000)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax   (623,000) 191,000    
Unrealized Gain (Loss) on Investments   (192,000) (308,000)    
Accumulated other comprehensive loss (25,613,000) (25,613,000) (31,751,000) $ (31,413,000) $ (12,752,000)
Available-for-sale Securities, Gross Unrealized Gain   106,000      
Available-for-sale Securities, Gross Realized Gains 3,000 1,000 279,000    
Investment Maturity Date Range One Year Or Less [Member]          
Investment [Line Items]          
Financial Instruments, Owned, Corporate Debt, at Fair Value 11,979,000 11,979,000 11,527,000    
Certificates of Deposit, at Carrying Value 52,048,000 52,048,000 27,968,000    
Marketable Securities 64,027,000 64,027,000 39,495,000    
Investment Maturity Date Range One To Eight Years [Member]          
Investment [Line Items]          
Financial Instruments, Owned, Corporate Debt, at Fair Value 29,523,000 29,523,000 70,559,000    
Certificates of Deposit, at Carrying Value 0 0 0    
Marketable Securities $ 29,523,000 29,523,000 70,559,000    
Other Long-term Investments [Member]          
Investment [Line Items]          
Available-for-sale Securities, Gross Unrealized Gain   $ 90,000 118,000    
Available-for-sale Securities, Gross Realized Gains     $ 89,000