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Property Dispositions (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Property | Dec. 31, 2020 USD ($) Property | Dec. 31, 2019 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net proceeds from sale of real estate investments | $ | $ 206,193 | $ 189,444 | $ 137,572
Gain on sale of real estate, net of tax | $ | 91,119 | 67,465 | 24,242
Provision for impairment of real estate | $ | $ 84,389 | $ 18,536 | $ 54,174
Operating Property [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of properties sold classified as held for sale | Property | 1 |  |
Land Parcel [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of properties sold classified as held for sale | Property | 1 |  |
Wholly Owned Properties [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Percent interest sold | 100.00% |  | 100.00%
Wholly Owned Properties [Member] | Minimum [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Percent interest sold |  | 50.00% |
Wholly Owned Properties [Member] | Maximum [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Percent interest sold |  | 100.00% |
Real Estate Sold [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Provision for impairment of real estate | $ | $ 112 | $ 958 | $ 1,836
Operating Properties [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of real estate properties sold | Property | 7 | 6 | 7
Land [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of real estate properties sold | Property | 5 | 11 | 6

X
- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References No definition available. + Details
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Namespace Prefix: | reg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net proceed from the sale of real estate that is held for investment. + References No definition available. + Details
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Namespace Prefix: | reg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of properties classified as held for sale. + References No definition available. + Details
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Namespace Prefix: | reg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Real Estate Properties Sold During the period. + References No definition available. + Details
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Namespace Prefix: | reg_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of limited partnership interest sold. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + 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=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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Balance Type: | debit
Period Type: | duration

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- 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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- Details
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Balance Type: |
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |