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Deferred Charges and Other Assets, net - Allocated values of above-market leases and below-market leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Above-Market Leases    
Above-Market Leases    
Original allocated value $ 56,377 $ 59,916
Less accumulated amortization (34,025) (35,737)
Allocated value net 22,352 24,179
Below-Market Leases    
Below-Market Leases    
Original allocated value 80,757 90,790
Less accumulated amortization (45,947) (53,727)
Allocated value net $ 34,810 $ 37,063