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Acquired Leases Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 473,679 | $ 502,132 |
Accumulated amortization |  | (284,880) | (259,310) |
Acquired lease intangible assets, net of amortization |  | 188,799 | 242,822 |
Finite-Lived Intangible Liabilities, Accumulated Accretion |  | (145,966) | (131,676) |
Off-market Lease, Unfavorable |  | 377,712 | 427,260 |
Finite-Lived Intangible Assets, Amortization Expense |  | 55,955 | 69,362 | $ 88,770
Acquired lease intangible liability accretion |  | 50,103 | 54,730 | 45,655
Partnership Interest [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Accumulated amortization |  | (284,880) | (259,310) |
Acquired lease intangible assets, net of amortization |  | 188,799 | 242,822 |
Off-market Lease, Unfavorable |  | 377,712 | 427,260 |
In-place leases, net [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 414,298 | 438,188 |
Finite-Lived Intangible Assets, Amortization Expense |  | 48,297 | 60,250 | 76,649
Above Market Leases [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 59,381 | 63,944 |
Finite-Lived Intangible Assets, Amortization Expense |  | 7,658 | 9,112 | 10,433
Off-Market Favorable Lease [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense | [1] |  |  | 1,688
Off-Market Lease, Unfavorable [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite Lived Intangible Liabilities, Gross |  | 523,678 | 558,936 |
Acquired lease intangible liability accretion |  | $ 50,103 | $ 54,730 | 45,561
Above Market Ground Lease Amortization [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired lease intangible liability accretion | [1] |  |  | $ 94
[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, where they continue to be amortized to Operating and maintenance in the accompanying Consolidated Statements of Operations.

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- Definition Finite-Lived Intangible Liabilities, Accumulated Accretion + References No definition available. + Details
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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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