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Investment in Unconsolidated Joint Ventures (Summary of Preliminary Balance Sheet) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Real Estate Properties [Line Items]      
Total Assets $ 3,485,032 $ 3,589,726 $ 3,628,403
Total Liabilities 2,456,127 2,487,109  
Total liabilities and equity 3,485,032 3,589,726  
Our ownership interest in PIM Highland JV 161,873 179,527  
PIM Highland JV [Member]
     
Real Estate Properties [Line Items]      
Total Assets 1,381,313 1,400,264  
Total Liabilities 1,136,681 1,132,977  
Members' equity 244,632 267,287  
Total liabilities and equity 1,381,313 1,400,264  
Our ownership interest in PIM Highland JV $ 161,873 $ 179,527