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SUPPLEMENTAL BALANCE SHEET INFORMATION - Deferred Charges (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred charges      
Initial franchise fees $ 6,463 $ 6,894  
Less - accumulated amortization (1,772) (1,673)  
Total 4,691 5,221  
Amortization expense $ 500 $ 400 $ 300