Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Real Estate Joint Ventures (Summary Balance Sheets for Unconsolidated Joint Ventures) (Details)

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Investments in Unconsolidated Real Estate Joint Ventures (Summary Balance Sheets for Unconsolidated Joint Ventures) (Details) (Partnership Interest [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Partnership Interest [Member]
   
Summary Balance Sheets of Unconsolidated Joint Ventures [Line Items]    
Land $ 95,748 $ 96,455
Buildings, improvements and fixtures 495,958 493,424
Construction in progress, including land 21,974 16,338
Real Estate Investment Property, at Cost, Total 613,680 606,217
Accumulated depreciation (68,667) (62,547)
Rental property, net 545,013 543,670
Assets held for sale (1) 0 1,828
Cash and cash equivalents 20,531 21,879
Deferred lease costs, net 23,080 24,411
Deferred debt origination costs, net 4,399 5,213
Prepaid and other assets 24,900 25,350
Total assets 617,923 622,351
Mortgages payable 329,262 325,192
Construction trade payables 14,232 21,734
Accounts payable and other liabilities 16,726 31,944
Total liabilities 360,220 378,870
Owners' equity 257,703 243,481
Total liabilities and owners' equity $ 617,923 $ 622,351