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Earnings per Share and Unit (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Document Fiscal Year Focus 2015  
Document Period End Date Mar. 31, 2015  
Earnings Per Share [Abstract]    
Gain on sale of real estate $ 803us-gaap_GainLossOnSaleOfProperties $ 715us-gaap_GainLossOnSaleOfProperties
Income per common unit - diluted    
Weighted Average Limited Partnership Units Outstanding, Basic 154,170us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 160,281us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding
Parent Company [Member]    
Earnings Per Share [Abstract]    
Income from operations 30,189us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24,341us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Gain on sale of real estate 803us-gaap_GainLossOnSaleOfProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
715us-gaap_GainLossOnSaleOfProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Less: income attributable to noncontrolling interests 552us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
401us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income from operations attributable to the Company 30,440us-gaap_IncomeLossFromContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24,655us-gaap_IncomeLossFromContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Preferred stock dividends (5,266)us-gaap_PreferredStockDividendsIncomeStatementImpact
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,266)us-gaap_PreferredStockDividendsIncomeStatementImpact
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Less: dividends paid on unvested restricted stock 176reg_DividendsPaidOnUnvestedRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
197reg_DividendsPaidOnUnvestedRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Add: dividends paid on Treasury Method restricted stock (28)reg_DividendsPaidOnTreasuryMethodRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11)reg_DividendsPaidOnTreasuryMethodRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Weighted average common units outstanding for basic EPU (in shares) 93,842,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
92,167,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Incremental units to be issued under unvested restricted stock (in shares) 58,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements 7,000us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Weighted average common units outstanding for diluted EPU (in shares) 93,907,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
92,191,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income per common share/unit - basic:    
Continuing operations (in dollars per share) $ 0.27us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 0.21us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income per common share/unit - diluted:    
Continuing operations (in dollars per share) $ 0.27us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 0.21us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Partnership Interest [Member]    
Earnings Per Share [Abstract]    
Income from operations 30,189us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
24,341us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Gain on sale of real estate 803us-gaap_GainLossOnSaleOfProperties
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
715us-gaap_GainLossOnSaleOfProperties
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Income from operations attributable to the Company 30,489us-gaap_IncomeLossFromContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
24,697us-gaap_IncomeLossFromContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Less: dividends paid on unvested restricted stock 176reg_DividendsPaidOnUnvestedRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
197reg_DividendsPaidOnUnvestedRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Add: dividends paid on Treasury Method restricted stock (28)reg_DividendsPaidOnTreasuryMethodRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
(11)reg_DividendsPaidOnTreasuryMethodRestrictedStock
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Less: preferred unit distributions 5,266reg_PreferredUnitDividendsAndOtherAdjustments
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
5,266reg_PreferredUnitDividendsAndOtherAdjustments
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Weighted average common units outstanding for basic EPU (in shares) 93,996,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
92,167,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Incremental units to be issued under unvested restricted stock (in shares) 58,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
24,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements 7,000us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
0us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Weighted average common units outstanding for diluted EPU (in shares) 94,061,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
92,191,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Income per common unit - basic    
Continuing operations (in dollars per share) $ 0.27us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
$ 0.21us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Income per common unit - diluted    
Continuing operations (in dollars per share) $ 0.27us-gaap_IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
$ 0.21us-gaap_IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Continuing Operations [Member] | Parent Company [Member]    
Earnings Per Share [Abstract]    
Net income attributable to common stockholders 24,998us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
19,192us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Net income for common stock unit/holders - diluted 25,026us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
19,203us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Continuing Operations [Member] | Partnership Interest [Member]    
Earnings Per Share [Abstract]    
Less: income attributable to noncontrolling interests 503us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
359us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Net income attributable to common stockholders 25,047us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
19,234us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Net income for common stock unit/holders - diluted $ 25,075us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
$ 19,245us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember