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
Jun. 30, 2015
Dec. 31, 2014
Assets    
Land $ 107,503 $ 102,601
Buildings, improvements and fixtures 630,777 542,501
Construction in progress, including land 27,628 104,780
Rental property, at cost, total 765,908 749,882
Accumulated depreciation (46,203) (48,233)
Total rental property, net 719,705 701,649
Cash and cash equivalents 47,793 46,917
Deferred lease costs, net 20,607 21,234
Deferred debt origination costs, net 4,706 5,995
Prepaids and other assets 12,833 12,766
Total assets 805,644 788,561
Liabilities and Owners' Equity    
Mortgages payable 385,275 358,219
Accounts payable and other liabilities 45,490 70,795
Total liabilities 430,765 429,014
Owners' equity 374,879 359,547
Total liabilities and owners' equity $ 805,644 $ 788,561