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Commitments and Contingencies, Letters of Credit (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
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Commitments and Contingencies Disclosure [Abstract] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 50,000,000 |
Letters of Credit Outstanding, Amount | $ 7,300,000 | $ 5,800,000

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- Definition Letters of Credit, Maximum Borrowing Capacity under Line + References No definition available. + Details
Name: | reg_LettersOfCreditMaximumBorrowingCapacityUnderLine
Namespace Prefix: | reg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant