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Future Minimum Base Rents and Lease Payments - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Contingent rental expense $ 10,740 $ 8,775 $ 8,651
Minimum rental expense $ 15,906 $ 12,412 $ 12,085