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Mortgage Loans Payable And Secured Revolving Credit Facilities (Schedule Of Secured Debt) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2012
Term Loan [Member]
Dec. 31, 2011
Stabilized Property Credit Facility [Member]
Dec. 31, 2011
Development Property Credit Facility [Member]
Dec. 31, 2012
Fixed-Rate Mortgages [Member]
Dec. 31, 2011
Fixed-Rate Mortgages [Member]
Dec. 31, 2012
Variable-Rate Mortgage [Member]
Dec. 31, 2011
Variable-Rate Mortgage [Member]
Dec. 31, 2012
Secured Debt [Member]
Dec. 31, 2011
Secured Debt [Member]
Dec. 31, 2012
Secured Debt [Member]
Fixed-Rate Mortgages [Member]
Dec. 31, 2011
Secured Debt [Member]
Fixed-Rate Mortgages [Member]
Dec. 31, 2012
Secured Debt [Member]
Variable-Rate Mortgage [Member]
Dec. 31, 2011
Secured Debt [Member]
Variable-Rate Mortgage [Member]
Dec. 31, 2012
Line of Credit [Member]
Dec. 31, 2011
Line of Credit [Member]
Dec. 31, 2012
Line of Credit [Member]
Revolving Credit Facility [Member]
Dec. 31, 2012
Line of Credit [Member]
Term Loan [Member]
Dec. 31, 2011
Line of Credit [Member]
Stabilized Property Credit Facility [Member]
Dec. 31, 2011
Line of Credit [Member]
Development Property Credit Facility [Member]
Dec. 31, 2012
Mortgages Related To Real Estate Held For Sale/Conveyance [Member]
Dec. 31, 2011
Mortgages Related To Real Estate Held For Sale/Conveyance [Member]
Dec. 31, 2012
Mortgages Related To Real Estate Held For Sale/Conveyance [Member]
Fixed-Rate Mortgages [Member]
Dec. 31, 2011
Mortgages Related To Real Estate Held For Sale/Conveyance [Member]
Fixed-Rate Mortgages [Member]
Dec. 31, 2011
Mortgages Related To Real Estate Held For Sale/Conveyance [Member]
Variable-Rate Mortgage [Member]
Debt Instrument [Line Items]                                                        
Total property-specific mortgages, Balance outstanding $ 605,216,000 $ 586,743,000 [1] $ 548,121,000 [1]         $ 544,799,000 [2] $ 522,975,000 [1],[2] $ 60,417,000 $ 63,768,000 [1] $ 605,216,000 $ 586,743,000 [1]                              
Weighted average interest rate                       5.30% 5.50% [1] 5.60% [2] 5.90% [1],[2] 3.00% 3.00% [1] 4.80% 5.20% [1] 2.80% 2.80% 5.50% [1] 2.50% [1] 6.10% [1] 5.70% [1] 6.10% [1] 5.70% [1] 5.90% [1]
Interest rate, minimum                           3.10% [2] 5.00% [1],[2]                     5.20% [1] 5.00% [1]  
Interest rate, maximum                           7.50% [2] 7.60% [1],[2]                     6.50% [1] 6.50% [1]  
Credit facilities 156,000,000 166,317,000   81,000,000 75,000,000 74,035,000 [1] 92,282,000 [1]                                          
Total secured debt 761,216,000 753,060,000 [1]                                                    
Mortgage loans payable - real estate held for sale/conveyance 23,258,000 124,888,000           23,258,000 [1] 105,988,000 [1]   18,900,000 [1]                         23,258,000 [1] 124,888,000 [1]      
Mortgage loans payable subject to interest rate swaps $ 31,417,000 $ 32,091,000                                                    
[1] Restated to reflect the reclassifications of properties subsequently treated as "held for sale/conveyance".
[2] At December 31, 2012 and 2011, the Company had approximately $31.4 million and $32.1 million, respectively, of mortgage loans payable subject to interest rate swaps which converted LIBOR-based variable rates to fixed annual rates ranging from 5.2% to 6.5% per annum.