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Future Minimum Base Rents and Lease Payments - Rental Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Contingent rental expense $ 8,944 $ 9,193 $ 10,740
Minimum rental expense $ 19,964 $ 19,900 $ 15,906