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Organization and Significant Accounting Policies - Organization and Principles of Consolidation (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) retail_shopping_center | Jun. 30, 2020 USD ($) retail_shopping_center Rent_Agreement
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Unsecured public and private notes | $ | $ 500.0 | $ 500.0
Operating Partnership [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Ownership percentage of outstanding common partnership units |  | 99.60%
COVID-19 [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Percentage of base rent collected from tenants | 72.00% |
Number of mutually accepted agreements | Rent_Agreement |  | 600
Pro-rata base rent | $ |  | $ 16.4
Percentage of annual base rent |  | 1.80%
Wholly Owned Properties [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of real estate properties | retail_shopping_center | 300 | 300
Unconsolidated Properties [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of real estate properties | retail_shopping_center | 115 | 115

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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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