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Acquisitions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property
Business Acquisition [Line Items] |  |  |
Number of retail operating properties acquired | property |  |  | 0
Payments to acquire real estate | $ | $ 65,298 | $ 58,205 | $ 0
2020 Operating Property Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Number of retail operating properties acquired | property | 1 |  |
2020 Operating Property Acquisitions | Retail Operating Property |  |  |
Business Acquisition [Line Items] |  |  |
Payments to acquire real estate | $ | $ 65,300 |  |
2019 Operating Property Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Number of retail operating properties acquired | property |  | 1 |
Number of parking garages acquired | property |  | 1 |
2019 Operating Property Acquisitions | Retail Operating Property |  |  |
Business Acquisition [Line Items] |  |  |
Payments to acquire real estate | $ |  | $ 29,000 |
2019 Operating Property Acquisitions | Parking Garage |  |  |
Business Acquisition [Line Items] |  |  |
Payments to acquire real estate | $ |  | $ 29,500 |
Lease Agreements | 2020 Operating Property Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average useful life (in years) | 3 years 2 months 12 days |  |
Lease Agreements | 2019 Operating Property Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average useful life (in years) |  | 5 years 7 months 6 days |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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