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Deferred Charges and Other Assets, net - Allocated values of above-market leases and below-market leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Above-Market Leases    
Above-Market Leases    
Original allocated value $ 150,829 $ 164,040
Less accumulated amortization (53,429) (60,210)
Allocated value net 97,400 103,830
Below-Market Leases    
Below-Market Leases    
Original allocated value 114,988 120,573
Less accumulated amortization (57,301) (55,489)
Allocated value net $ 57,687 $ 65,084