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
Sep. 30, 2018
Dec. 31, 2017
Assets    
Land $ 94,118 $ 95,686
Buildings, improvements and fixtures 503,430 505,618
Construction in progress 3,169 3,005
Rental property, at cost, total 600,717 604,309
Accumulated depreciation (110,213) (93,837)
Total rental property, net 490,504 510,472
Cash and cash equivalents 13,366 25,061
Deferred lease costs and other intangibles, net 9,387 10,985
Prepaids and other assets 18,142 15,073
Total assets 531,399 561,591
Liabilities and Owners' Equity    
Mortgages payable, net 360,600 351,259
Accounts payable and other liabilities 11,114 14,680
Total liabilities 371,714 365,939
Owners' equity 159,685 195,652
Total liabilities and owners' equity $ 531,399 $ 561,591