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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, 2018
location
Operating Leased Assets [Line Items]      
Number of locations the Company as lessee | location     3,090
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  
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      
Operating Leased Assets [Line Items]      
Lease term for most restaurants     10 years
Maximum      
Operating Leased Assets [Line Items]      
Lease term for most restaurants     20 years