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Deferred Charges and Other Assets, net - Allocated values of above-market leases and below-market leases (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Above-Market Leases |  |
Allocated value net | $ 59,883 |
Above Market |  |
Above-Market Leases |  |
Original allocated value | 164,040 | $ 181,851
Less accumulated amortization | (60,210) | (57,505)
Allocated value net | 103,830 | 124,346
Below Market |  |
Below-Market Leases |  |
Original allocated value | 120,573 | 144,713
Less accumulated amortization | (55,489) | (58,400)
Allocated value, net | $ 65,084 | $ 86,313

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