Annual report pursuant to Section 13 and 15(d)

Mortgages Payable And Other Debt Disclosures (Summary Of The Debt Obligations And Interest Rate Derivatives) (Details)

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Mortgages Payable And Other Debt Disclosures (Summary Of The Debt Obligations And Interest Rate Derivatives) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Line of credit $ 46,000 $ 10,000
Term notes 575,000 400,000
Mortgage note, total 4,423 78,954
Interest rate derivatives - liability 10,748 10,528
Line Of Credit - Variable Rate LIBOR + 2.0% (2.28% At December 31, 2011) [Member]
   
Debt Instrument [Line Items]    
Line of credit 46,000  
Debt Instrument, Fair Value 46,000  
Payables due 2016 46,000  
Term Note - Variable Rate LIBOR+1.50% (1.99% At December 31, 2011) [Member]
   
Debt Instrument [Line Items]    
Payables due 2013 20,000  
Term notes 20,000  
Term note, fair value 20,000  
Term Note - Variable Rate LIBOR+2.0% (2.27% At December 31, 2011)
   
Debt Instrument [Line Items]    
Payables due thereafter 125,000  
Term note, fair value 125,000  
Mortgage note, total 125,000  
Term Note - Variable Rate LIBOR+2.0% (2.30% At December 31, 2011)
   
Debt Instrument [Line Items]    
Payables due thereafter 100,000  
Term note, fair value 100,000  
Mortgage note, total 100,000  
Term Note - Fixed Rate 6.26% [Member]
   
Debt Instrument [Line Items]    
Payables due 2013 80,000  
Term notes 80,000  
Term note, fair value 84,627  
Term Note - Fixed Rate 6.38% [Member]
   
Debt Instrument [Line Items]    
Payables due 2016 150,000  
Term notes 150,000  
Term note, fair value 162,451  
Term Note - Fixed Rate 5.54% [Member]
   
Debt Instrument [Line Items]    
Payables due thereafter 100,000  
Term note, fair value 95,926  
Mortgage note, total 100,000  
6.76% Mortgage Note Due September 2013 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Fair Value 964  
Payables due 2012 29  
Payables due 2013 896  
Mortgage note, total 925 952
6.35% Mortgage Note Due March 2014 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Fair Value 1,059  
Payables due 2012 31  
Payables due 2013 34  
Payables due 2014 949  
Mortgage note, total 1,014 1,044
5.99% Mortgage Note Due May 2026 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Fair Value 2,500  
Payables due 2012 112  
Payables due 2013 119  
Payables due 2014 126  
Payables due 2015 134  
Payables due 2016 142  
Payables due thereafter 1,851  
Mortgage note, total $ 2,484