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Deferred Charges and Other Assets, net - Allocated values of above-market leases and below-market leases (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Above-Market Leases |  |
Above-Market Leases |  |
Original allocated value | $ 55,119 | $ 59,916
Less accumulated amortization | (35,394) | (35,737)
Allocated value net | 19,725 | 24,179
Below-Market Leases |  |
Below-Market Leases |  |
Original allocated value | 77,346 | 90,790
Less accumulated amortization | (46,153) | (53,727)
Allocated value net | $ 31,193 | $ 37,063

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