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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, 2020 | Dec. 31, 2019
--- | --- | ---
Above-Market Leases |  |
Above-Market Leases |  |
Original allocated value | $ 55,809 | $ 59,916
Less accumulated amortization | (34,785) | (35,737)
Allocated value net | 21,024 | 24,179
Below-Market Leases |  |
Below-Market Leases |  |
Original allocated value | 80,275 | 90,790
Less accumulated amortization | (47,216) | (53,727)
Allocated value net | $ 33,059 | $ 37,063

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