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Organization and Principles of Consolidation Variable Interest Entities (Details) $ in Thousands | Sep. 30, 2019 USD ($) retail_shopping_center | Dec. 31, 2018 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | $ 18,373 | $ 18,432
Noncontrolling Interest in Variable Interest Entity | 30,941 | 30,280
Real Estate [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 319,290 | 112,085
Cash and Cash Equivalents [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 18,270 | $ 7,309
Partially Owned Properties [Member] |  |
Variable Interest Entity [Line Items] |  |
Number of Real Estate Properties | retail_shopping_center | 128 |
Consolidated Properties [Member] |  |
Variable Interest Entity [Line Items] |  |
Number of Real Estate Properties | retail_shopping_center | 11 |

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- Definition Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5710-111685 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5710-111685 + Details
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Balance Type: | credit
Period Type: | instant

X
- 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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- Details
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X
- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |