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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Document Fiscal Year Focus 2015  
Other comprehensive loss:    
Effective portion of change in fair value of derivative instruments $ (13,882)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax $ (13,800)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Parent Company [Member]    
Net income (30,992)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(25,056)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other comprehensive loss:    
Amortization of loss on settled derivative instruments recognized in net income 2,107reg_AmortizationOfLossOnDerivativeInstruments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,367reg_AmortizationOfLossOnDerivativeInstruments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Effective portion of change in fair value of derivative instruments (13,882)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(13,800)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Less: reclassification adjustment for change in fair value of derivative instruments included in net income 142us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
152us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other comprehensive loss (11,633)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,281)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income 19,359us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,775us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Less: comprehensive income (loss) attributable to noncontrolling interests:    
Net income attributable to noncontrolling interests (552)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(401)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other comprehensive loss attributable to noncontrolling interests (104)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(86)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income attributable to noncontrolling interests 448us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
315us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income attributable to the Company 18,911us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,460us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Partnership Interest [Member]    
Net income (30,992)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
(25,056)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Other comprehensive loss:    
Amortization of loss on settled derivative instruments recognized in net income 2,107reg_AmortizationOfLossOnDerivativeInstruments
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
2,367reg_AmortizationOfLossOnDerivativeInstruments
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Effective portion of change in fair value of derivative instruments (13,882)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
(13,800)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Less: reclassification adjustment for change in fair value of derivative instruments included in net income 142us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
152us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Other comprehensive loss (11,633)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
(11,281)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Comprehensive income 19,359us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
13,775us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Less: comprehensive income (loss) attributable to noncontrolling interests:    
Net income attributable to noncontrolling interests (503)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
(359)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Other comprehensive loss attributable to noncontrolling interests (86)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
(66)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Comprehensive income attributable to noncontrolling interests 417us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
293us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Comprehensive income attributable to the Company $ 18,942us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
$ 13,482us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember