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Intangible Assets and Intangible Liabilities - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible assets: |  |  |
Gross amount | $ 479,657 | $ 515,889 |
Accumulated amortization | (270,913) | (245,444) |
Intangible assets, Net | 208,744 | 270,445 |
Intangible liabilities: |  |  |
Gross amount | 174,670 | 185,191 |
Accumulated amortization | (100,881) | (89,200) |
Intangible Liabilities, Net | 73,789 | 95,991 |
Amortization of above and below-market leases, net | (10,991) | (16,059) | $ (19,523)
Leases, Acquired-in-Place, Market Adjustment [Member] |  |  |
Intangible liabilities: |  |  |
Amortization of above and below-market leases, net | (10,991) | (16,059) | (19,523)
Leases, Acquired-in-Place [Member] |  |  |
Intangible liabilities: |  |  |
Amortization of acquired in-place leases (component of "depreciation and amortization") | $ 48,932 | $ 58,814 | $ 76,016

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- Definition Amount of non-cash amortization of intangible asset (liability) for above and below market leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + 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=118932676&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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