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Deferred Leasing Costs and Acquisition-Related Intangible Assets and Liabilities, net - Amortization of Deferred Leasing Costs and Acquisition-related Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amortization for the period related to deferred leasing costs and acquisition-related intangibles |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles | $ 35,130 | $ 45,188 | $ 40,415
Deferred leasing costs [Member] |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles | 33,624 | 35,779 | 34,341
Estimated annual amortization related to acquisition-related intangible assets |  |  |
Finite-lived intangible assets, 2021 | 31,048 |  |
Finite-lived intangible assets, 2022 | 28,334 |  |
Finite-lived intangible assets, 2023 | 24,470 |  |
Finite-lived intangible assets, 2024 | 21,545 |  |
Finite-lived intangible assets, 2025 | 19,726 |  |
Finite-lived intangible assets, thereafter | 71,156 |  |
Finite-lived intangible assets | 196,279 | 185,881 |
Above market leases [Member] |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles | 495 | 192 | 444
Estimated annual amortization related to acquisition-related intangible assets |  |  |
Finite-lived intangible assets | 0 | 495 |
In-place leases [Member] |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles | 11,759 | 18,615 | 15,915
Estimated annual amortization related to acquisition-related intangible assets |  |  |
Finite-lived intangible assets, 2021 | 6,531 |  |
Finite-lived intangible assets, 2022 | 3,885 |  |
Finite-lived intangible assets, 2023 | 1,534 |  |
Finite-lived intangible assets, 2024 | 584 |  |
Finite-lived intangible assets, 2025 | 473 |  |
Finite-lived intangible assets, thereafter | 1,663 |  |
Finite-lived intangible assets | 14,670 | 26,429 |
Below-market ground lease obligation [Member] |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles | 0 | 0 | 8
Below-market operating leases [Member] |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles |  |  |
Amortization of intangible liabilities | (10,748) | (9,398) | (10,192)
Estimated annual amortization related to acquisition-related intangible liabilities |  |  |
Acquisition-related intangible liabilities, 2021 | (4,152) |  |
Acquisition-related intangible liabilities, 2022 | (3,167) |  |
Acquisition-related intangible liabilities, 2023 | (1,486) |  |
Acquisition-related intangible liabilities, 2024 | (812) |  |
Acquisition-related intangible liabilities, 2025 | (710) |  |
Acquisition-related intangible liabilities, thereafter | (3,018) |  |
Acquisition-related intangible liabilities | (13,345) | (24,092) |
Above-market ground lease obligation [Member] |  |  |
Amortization for the period related to deferred leasing costs and acquisition-related intangibles |  |  |
Amortization of intangible liabilities | $ 0 | $ 0 | $ (101)

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