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Acquired Leases Intangibles - Future Amorization and Minimum Rent, net (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Amortization Expense [Abstract]  
2013 $ 10,603us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2014 8,569us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2015 6,589us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2016 5,354us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2017 4,374us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Net Accretion [Abstract]  
2013 3,888reg_FutureAccretionYearOne
2014 3,393reg_FutureAccretionYearTwo
2015 3,088reg_FutureAccretionYearThree
2016 2,609reg_FutureAccretionYearFour
2017 $ 2,417reg_FutureAccretionYearFive