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Acquired Leases Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 606,758 | $ 627,106 |
Accumulated amortization | (219,689) | (148,280) |
Acquired lease intangible assets, net of amortization | 387,069 | 478,826 |
Finite LIved Intangible Liabilities | 589,472 | 593,951 |
Finite-Lived Intangible Liabilities, Accumulated Accretion | (92,746) | (56,550) |
Finite-Lived Intangible Assets, Amortization Expense | 88,770 | 99,613 | $ 14,386
Acquired lease intangible liability accretion | 45,655 | 34,922 | 6,994
Off-Market Lease, Unfavorable [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite Lived Intangible Liabilities, Gross | 584,371 | 588,850 |
Acquired lease intangible liability accretion | 45,561 | 34,786 | 6,827
Above Market Ground Rent Lease [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite Lived Intangible Liabilities, Gross | 5,101 | 5,101 |
Above Market Leases [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired lease intangible liability accretion | 94 | 136 | 167
In-place leases, net |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 457,379 | 470,315 |
Finite-Lived Intangible Assets, Amortization Expense | 76,649 | 88,284 | 11,533
Above Market Leases [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 57,294 | 64,625 |
Finite-Lived Intangible Assets, Amortization Expense | 10,433 | 9,443 | 1,742
Above-market ground leases, net |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 92,085 | 92,166 |
Finite-Lived Intangible Assets, Amortization Expense | 1,688 | 1,886 | $ 1,111
Partnership Interest [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | (219,689) | (148,280) |
Acquired lease intangible assets, net of amortization | 387,069 | 478,826 |
Off-market Lease, Unfavorable | $ 496,726 | $ 537,401 |

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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=109223946&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=6877327&loc=d3e13212-122682 + Details
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