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) - Unconsolidated Properties [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Land $ 94,138 $ 95,686
Buildings, improvements and fixtures 500,209 505,618
Construction in progress, including land under development 3,094 3,005
Rental property, at cost, total 597,441 604,309
Accumulated depreciation (98,614) (93,837)
Total rental property, net 498,827 510,472
Cash and cash equivalents 19,848 25,061
Deferred lease costs and other intangibles, net 10,405 10,985
Prepaids and other assets 14,614 15,073
Total assets 543,694 561,591
Liabilities and Owners' Equity    
Mortgages payable, net 351,016 351,259
Accounts payable and other liabilities 11,289 14,680
Total liabilities 362,305 365,939
Owners' equity 181,389 195,652
Total liabilities and owners' equity $ 543,694 $ 561,591