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, 2017
Dec. 31, 2016
Assets    
Land $ 95,998 $ 88,015
Buildings, improvements and fixtures 514,865 503,548
Construction in progress, including land under development 2,849 13,037
Rental property, at cost, total 613,712 604,600
Accumulated depreciation (88,163) (67,431)
Total rental property, net 525,549 537,169
Cash and cash equivalents 23,769 27,271
Deferred lease costs and other intangibles, net 11,436 13,612
Prepaids and other assets 16,262 12,567
Total assets 577,016 590,619
Liabilities and Owners' Equity    
Mortgages payable, net 351,322 335,971
Accounts payable and other liabilities 13,463 20,011
Total liabilities 364,785 355,982
Owners' equity 212,231 234,637
Total liabilities and owners' equity $ 577,016 $ 590,619