Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details)

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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Deer Park [Member]
sqft
Dec. 31, 2012
Deer Park [Member]
sqft
Dec. 31, 2011
Deer Park [Member]
Mezzanine and Senior Loans Combined [Member]
Jun. 30, 2013
Deer Park [Member]
Mezzanine Loan [Member]
Jun. 30, 2013
Deer Park [Member]
Mezzanine Loan [Member]
Jun. 30, 2013
Deer Park [Member]
Senior Loans [Member]
Jun. 30, 2013
Deer Park [Member]
Senior Loans [Member]
Jun. 30, 2013
Deer Park Warehouse [Member]
Dec. 31, 2012
Deer Park Warehouse [Member]
sqft
Jun. 30, 2013
National Harbor [Member]
sqft
store
Jun. 30, 2013
National Harbor [Member]
sqft
store
Dec. 31, 2012
National Harbor [Member]
sqft
Mar. 31, 2013
Cookstown [Member]
Jun. 30, 2013
Cookstown [Member]
sqft
store
Jun. 30, 2013
Ottawa [Member]
store
sqft
Jun. 30, 2013
Westgate [Member]
Dec. 31, 2012
Westgate [Member]
sqft
Jul. 31, 2013
Subsequent Event [Member]
Deer Park [Member]
Mezzanine and Senior Loans Combined [Member]
Schedule of Equity Method Investments [Line Items]                                        
Equity method investments $ 162.1 $ 126.6 $ 2.0 $ 3.0             $ 0 $ 17.3 $ 17.3 $ 2.6       $ 16.8 $ 19.1  
Secured debt         246.9                              
Interest rate terms             LIBOR + 5.00%   LIBOR + 3.50%                      
Debt Instrument, Default Interest Rate           LIBOR + 9%   PRIME + 7.5%                        
Joint Venture Required Additional Principal Payment                                       10
Debt Instrument, Periodic Payment, Principal                                       10
Tanger's Portion of Principal Payment                                       5
Proceeds from sale of foreclosed assets                   1.2                    
Number of outlet stores                       80 80     35 80      
Estimated square footage of real estate property when completed                         340,000              
Company portion of contributed capital to the joint venture                         17.2              
Joint Venture Debt                       62.0 62.0              
Interst Rate, Basis Spread on Variable Rate                       1.65%                
Joint Venture Debt Outstanding 336.3 325.2 246.9 246.9             1.9 4.2 4.2 0       42.2 32.0  
Payments to acquire real estate                             $ 13.9   $ 28.7      
Estimated Square Feet of Expansion                               153,000        
Area of Real Estate Property     741,981 741,981             29,253 0 0 0     303,000   332,234