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Operating Lease Agreements (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 22, 2017
USD ($)
Mar. 31, 2010
USD ($)
Dec. 31, 2017
USD ($)
location
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]        
Number of locations the Company as lessee | location     2,743  
Lease term of aircraft operating lease agreement   8 years    
Periodic payments for aircraft operating lease agreement   $ 690    
Fixed amount of early purchase option   26,685    
Cash deposit as collateral for obligations assumed under the agreement   $ 5,325 $ 2,500 $ 5,325
Aircraft operating lease renewal term 10 years      
Periodic payments for aircraft renewal operating lease agreement $ 442      
Collateral deposit for aircraft operating lease $ 2,500      
Minimum [Member]        
Operating Leased Assets [Line Items]        
Lease term for most restaurants     10 years  
Maximum [Member]        
Operating Leased Assets [Line Items]        
Lease term for most restaurants     20 years