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Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
segment
region
Dec. 31, 2011
Dec. 31, 2010
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Number of regions 6    
Number of reportable segments 1    
Unredeemed gift card sales percentage 4.00% 5.00% 5.00%
Gift card breakage revenue recognition period 6 months    
Gift card breakage recognized $ 2,070 $ 1,524 $ 1,188
Investment impairment charges 0 0 0
Investment maturity term 2 years    
Acquisition, development and construction of restaurant capitalized costs 10,038 9,616 8,167
Goodwill impairment charges 0 0 0
Restricted cash asset 24,799 15,313  
Aggregate impairment loss recognized on disposition of assets 0 380 751
Advertising and marketing costs 34,999 31,902 26,190
Maximum reasonably assured lease term 20 years    
Percentage of cash and investments balances not federally backed or federally insured 50.00%    
Accrued Payroll And Benefits [Member]
      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Estimated insurance liability 22,540 17,437  
Accrued Liabilities [Member]
      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Estimated insurance liability $ 5,220 $ 4,250  
Canada [Member]
      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 5    
London, England [Member]
      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 5    
Paris, France [Member]
      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 1    
ShopHouse Southeast Asian Kitchen [Member]
      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 1