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Operating lease agreements (Schedule of Rent Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Minimum rentals $ 136,328 $ 138,496 $ 122,726
Contingent rentals based on sales 48,516 64,720 51,727
Total rent expense $ 184,844 $ 203,216 $ 174,453