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Derivatives (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivatives in FASB
ASC Topic 815 Cash
Flow Hedging
Relationships:
Amount of Gain (Loss)
Recognized in OCI on
Derivative (Effective
Portion)
 
Location and Amount of Gain
(Loss) Reclassified
from Accumulated
OCI into Income
(Effective Portion)
 
Location and Amount of Gain or
(Loss) Recognized in
Income on  Derivative
(Ineffective Portion and
Amount Excluded from
Effectiveness Testing)
 
Three months ended March 31,
 
 
 
Three months ended March 31,
 
 
 
Three months ended March 31,
 
2015
 
2014
 
 
 
2015
 
2014
 
 
 
2015
 
2014
Interest rate swaps
$
(13,882
)
 
(13,800
)
 
Interest
expense
 
$
(2,249
)
 
(2,519
)
 
Other expenses
 
$
—

 
—



    
Document Period End Date Mar. 31, 2015    
Document Fiscal Year Focus 2015    
Effective portion of change in fair value of derivative instruments $ (13,882,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax $ (13,800,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax  
Amount reclassified from accumulated other comprehensive loss (2,249,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet (2,519,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet  
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 9,100,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths    
Assets [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 220,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_AssetsMember		    
Derivative @ 2.196% 28.1K [Member]      
Derivative [Line Items]      
Derivative, Inception Date Oct. 16, 2013    
Derivative, Maturity Date Oct. 16, 2020    
Derivative, Notional Amount 28,100,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative2.19628.1KMember		    
Derivative, Description of Variable Rate Basis 1 Month LIBOR    
Derivative, Fixed Interest Rate 2.196%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative2.19628.1KMember		    
Derivative Liability, Fair Value, Gross Liability (1,109,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative2.19628.1KMember		 [1]   (764,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative2.19628.1KMember		 [1]
Derivative B @ 2.479% 50K [Member] [Member]      
Derivative [Line Items]      
Derivative, Inception Date Aug. 01, 2015    
Derivative, Maturity Date Aug. 01, 2025    
Derivative, Early Termination Date Feb. 01, 2016 [2]    
Derivative, Notional Amount 50,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_DerivativeB247950KMemberMember		    
Derivative, Description of Variable Rate Basis 3 Month LIBOR    
Derivative, Fixed Interest Rate 2.479%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_DerivativeB247950KMemberMember		    
Derivative Liability, Fair Value, Gross Liability (1,696,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_DerivativeB247950KMemberMember		 [1]   (193,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_DerivativeB247950KMemberMember		 [1]
Derivative @ 2.479% 75K [Member]      
Derivative [Line Items]      
Derivative, Inception Date Aug. 01, 2015    
Derivative, Maturity Date Aug. 01, 2025    
Derivative, Early Termination Date Feb. 01, 2016 [2]    
Derivative, Notional Amount 75,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247975KMemberMember		    
Derivative, Description of Variable Rate Basis 3 Month LIBOR    
Derivative, Fixed Interest Rate 2.479%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247975KMemberMember		    
Derivative Liability, Fair Value, Gross Liability (2,543,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247975KMemberMember		 [1]   (289,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247975KMemberMember		 [1]
Derivative A @ 2.479% 50K [Member]      
Derivative [Line Items]      
Derivative, Inception Date Aug. 01, 2015    
Derivative, Maturity Date Aug. 01, 2025    
Derivative, Early Termination Date Feb. 01, 2016 [2]    
Derivative, Notional Amount 50,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247950KMemberMember		    
Derivative, Description of Variable Rate Basis 3 Month LIBOR    
Derivative, Fixed Interest Rate 2.479%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247950KMemberMember		    
Derivative Liability, Fair Value, Gross Liability (1,696,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247950KMemberMember		 [1]   (193,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative247950KMemberMember		 [1]
Derivative @ 3.41% 45K [Member] [Member]      
Derivative [Line Items]      
Derivative, Inception Date Aug. 01, 2015    
Derivative, Maturity Date Aug. 01, 2025    
Derivative, Early Termination Date Feb. 01, 2016 [2]    
Derivative, Notional Amount 45,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.4145KMemberMember		    
Derivative, Description of Variable Rate Basis 3 Month LIBOR    
Derivative, Fixed Interest Rate 3.4115%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.4145KMemberMember		    
Derivative Liability, Fair Value, Gross Liability (5,387,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.4145KMemberMember		 [1]   (3,964,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.4145KMemberMember		 [1]
Derivative @ 3.488% 20K [Member]      
Derivative [Line Items]      
Derivative, Inception Date Jun. 15, 2017    
Derivative, Maturity Date Jun. 15, 2027    
Derivative, Early Termination Date Dec. 15, 2017 [2]    
Derivative, Notional Amount 20,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48820KMember		    
Derivative, Description of Variable Rate Basis 3 Month LIBOR    
Derivative, Fixed Interest Rate 3.4875%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48820KMember		    
Derivative Liability, Fair Value, Gross Liability (1,840,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48820KMember		 [1]   (1,227,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48820KMember		 [1]
Derivative @ 3.48% 100K [Member]      
Derivative [Line Items]      
Derivative, Inception Date Jun. 15, 2017    
Derivative, Maturity Date Jun. 15, 2027    
Derivative, Early Termination Date Dec. 15, 2017 [2]    
Derivative, Notional Amount 100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100KMember		    
Derivative, Description of Variable Rate Basis 3 Month LIBOR    
Derivative, Fixed Interest Rate 3.48%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100KMember		    
Derivative Liability, Fair Value, Gross Liability (9,132,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100KMember		 [1]   (6,080,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100KMember		 [1]
Swap [Member]      
Derivative [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 7,800,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember		    
Derivative @ 3.48% 100K 2 [Member]      
Derivative [Line Items]      
Derivative, Inception Date Jun. 15, 2017    
Derivative, Maturity Date Jun. 15, 2027    
Derivative, Early Termination Date Dec. 15, 2017 [2]    
Derivative, Notional Amount 100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100K2Member		    
Derivative, Description of Variable Rate Basis 3 Month LIBOR    
Derivative, Fixed Interest Rate 3.48%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100K2Member		    
Derivative Liability, Fair Value, Gross Liability (9,132,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100K2Member		 [1]   (6,084,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= reg_Derivative3.48100K2Member		 [1]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Liability $ (32,535,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1]   $ (18,794,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1]
2015 Debt Issuance [Member] | Derivative [Member]      
Derivative [Line Items]      
Derivative, Fixed Interest Rate 2.67%reg_Derivativeweightedaveragefixedinterestrate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DerivativeMember
/ us-gaap_DerivativeInstrumentRiskAxis
= reg_A2015DebtIssuanceMember		    
2017 Debt issuance [Member] | Derivative [Member]      
Derivative [Line Items]      
Derivative, Fixed Interest Rate 3.48%reg_Derivativeweightedaveragefixedinterestrate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DerivativeMember
/ us-gaap_DerivativeInstrumentRiskAxis
= reg_A2017DebtissuanceMember		    
[1] (2) Derivatives in a liability position are included within Accounts Payable and Other Liabilities in the accompanying Consolidated Balance Sheets.
[2] Represents the date specified in the agreement for either optional or mandatory early termination which will result in cash settlement.