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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

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