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Intangible Assets and Below Market Lease Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangible assets and below market lease liabilities, net [Abstract] |  |  |
Deferred leasing costs, gross | $ 361,027 | $ 377,472 |
Deferred leasing costs, accumulated amortization | (151,698) | (146,125) |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 209,329 | 231,347 |
Acquisition-related below market lease liabilities, gross | 63,748 | 65,971 |
Acquisition-related below market lease liabilities, accumulated amortization | (37,838) | (34,014) |
Acquisition-related below market lease liabilities, net | 25,910 | 31,957 |
Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member] |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 194,121 |  |
Amortization of intangible assets and below market lease liabilities |  |  |
Amortization of intangible assets | 34,401 | 37,386 | $ 36,486
Lease Incentives [Member] |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 10,915 |  |
Amortization of intangible assets and below market lease liabilities |  |  |
Amortization of intangible assets | 1,847 | 4,281 | 1,908
Acquisition-Related Intangible Assets (in Rental and Other Revenue) [Member] |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 4,293 |  |
Amortization of intangible assets and below market lease liabilities |  |  |
Amortization of intangible assets | 1,137 | 1,290 | 1,677
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member] |  |  |
Amortization of intangible assets and below market lease liabilities |  |  |
Amortization of intangible assets | 510 | 557 | 557
Acquisition-Related Below Market Lease Liabilities [Member] |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |
Acquisition-related below market lease liabilities, net | 25,910 |  |
Amortization of intangible assets and below market lease liabilities |  |  |
Amortization of acquisition-related below market lease liabilities | $ (6,031) | $ (6,633) | $ (6,085)

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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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