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Fair Value Measurements - Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Document Fiscal Year Focus 2014  
Unsecured Credit Facilities [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 1.30%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DebtInstrumentAxis
= reg_UnsecuredCreditFacilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1.40%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DebtInstrumentAxis
= reg_UnsecuredCreditFacilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Unsecured Credit Facilities [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 1.30%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DebtInstrumentAxis
= reg_UnsecuredCreditFacilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1.40%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DebtInstrumentAxis
= reg_UnsecuredCreditFacilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Notes Receivable [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 7.38%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
7.75%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Notes Receivable [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 7.38%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
7.75%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Notes Payable to Banks [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 0.90%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesPayableToBanksMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
3.00%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesPayableToBanksMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Notes Payable to Banks [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 3.40%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesPayableToBanksMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
3.50%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_NotesPayableToBanksMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable, Fair Value 11,980us-gaap_NotesReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
11,600us-gaap_NotesReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable, Fair Value 2,116,000us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
1,936,400us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Unsecured Credit Facilities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 75,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= reg_UnsecuredCreditFacilitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
75,400us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= reg_UnsecuredCreditFacilitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member