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Acquired Intangible Assets and Liabilities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of below market leases | $ (6,800) | $ (700) | $ (20,600) | $ (4,700)
Expected average remaining lives of acquired below market leases (in years) |  |  | 8 years 3 months 12 days |
Amortization of acquired in-place lease value and deferred leasing costs |  |  | $ 317,355 | 145,262
Acquired in-place lease value |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Expected average remaining lives (in years) |  |  | 6 years 2 months 2 days |
Amortization of acquired in-place lease value and deferred leasing costs | 50,200 | 20,100 | $ 162,300 | 48,700
Weighted average remaining contractual life for acquired leases excluding renewals or extensions (in years) |  |  | 5 years 8 months 4 days |
Tenant relationship value |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of acquired in-place lease value and deferred leasing costs | $ 30,800 | $ 19,900 | $ 92,800 | $ 55,000
Weighted average remaining contractual life for acquired leases excluding renewals or extensions (in years) |  |  | 14 years 6 months 1 day |
Acquired above-market leases |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Expected average remaining lives (in years) |  |  | 3 years 11 days |

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- Definition Acquired Below Market Leases, Weighted Average Useful Life + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of amortization of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Weighted average period before the next renewal or extension (both explicit and implicit) for intangible assets that have been renewed or extended, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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