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Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]    
Document Fiscal Year Focus 2015  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (2,249)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet $ (2,519)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,249us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
2,519us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (13,882)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(13,800)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Beginning balance (58,498)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(17,883)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Current period other comprehensive income, net (11,633)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(11,281)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance (70,131)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(29,164)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,249us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
2,519us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Partnership Interest [Member]    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Beginning balance (57,748)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
 
Current period other comprehensive income, net (11,633)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
(11,281)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Ending balance (69,277)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
 
Partnership Interest [Member] | General Partner [Member]    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Current period other comprehensive income, net 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_GeneralPartnerMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_GeneralPartnerMember
Partnership Interest [Member] | Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Current period other comprehensive income, net (11,529)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(11,195)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Controlling [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (13,739)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(13,670)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Beginning balance (57,748)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(17,404)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Current period other comprehensive income, net (11,529)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(11,195)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Ending balance (69,277)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(28,599)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,210us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
2,475us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ reg_EquityOwnershipComponentsAxis
= reg_ControllingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Noncontrolling Interest [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (143)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(130)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Beginning balance (750)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(479)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Current period other comprehensive income, net (104)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(86)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Ending balance (854)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(565)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ 39us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
$ 44us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ reg_EquityOwnershipComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember