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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, 2018
Dec. 31, 2017
Above-Market Leases    
Above-Market Leases    
Original allocated value $ 152,270 $ 164,040
Less accumulated amortization (52,021) (60,210)
Allocated value net 100,249 103,830
Below-Market Leases    
Below-Market Leases    
Original allocated value 118,089 120,573
Less accumulated amortization (56,029) (55,489)
Allocated value net $ 62,060 $ 65,084