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Acquired Leases Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 502,132 | $ 606,758 |
Accumulated amortization |  | (259,310) | (219,689) |
Acquired lease intangible assets, net of amortization |  | 242,822 | 387,069 |
Finite Lived Intangible Liabilities |  | 558,936 | 589,472 |
Finite-Lived Intangible Liabilities, Accumulated Accretion |  | (131,676) | (92,746) |
Off-market Lease, Unfavorable |  | 427,260 | 496,726 |
Finite-Lived Intangible Assets, Amortization Expense |  | 69,362 | 88,770 | $ 99,613
Acquired lease intangible liability accretion |  | 54,730 | 45,655 | 34,922
Partnership Interest [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Accumulated amortization |  | (259,310) | (219,689) |
Acquired lease intangible assets, net of amortization |  | 242,822 | 387,069 |
Off-market Lease, Unfavorable |  | 427,260 | 496,726 |
In-place leases, net [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 438,188 | 457,379 |
Finite-Lived Intangible Assets, Amortization Expense |  | 60,250 | 76,649 | 88,284
Above Market Leases [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 63,944 | 57,294 |
Finite-Lived Intangible Assets, Amortization Expense |  | 9,112 | 10,433 | 9,443
Off-Market Favorable Lease [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | [1] |  | 92,085 |
Finite-Lived Intangible Assets, Amortization Expense | [1] |  | 1,688 | 1,886
Off-Market Lease, Unfavorable [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite Lived Intangible Liabilities, Gross |  | 558,936 | 584,371 |
Acquired lease intangible liability accretion |  | $ 54,730 | 45,561 | 34,786
Above Market Ground Rent Lease [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite Lived Intangible Liabilities, Gross | [1] |  | 5,101 |
Above Market Ground Lease Amortization [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired lease intangible liability accretion | [1] |  | $ 94 | $ 136
[1] | On January 1, 2019, the Company adopted the new accounting guidance in ASC Topic 842, Leases, including all related ASUs, and correspondingly reclassified Below-market ground leases and Above-market ground leases against the Company’s Right of use asset.

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