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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

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