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SUPPLEMENTAL BALANCE SHEET INFORMATION - Deferred Charges (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred charges      
Initial franchise fees $ 6,615 $ 6,463  
Less - accumulated amortization (1,906) (1,772)  
Total 4,709 4,691  
Amortization expense $ 400 $ 500 $ 400