Annual report pursuant to Section 13 and 15(d)

Investments in Unconsolidated Real Estate Joint Ventures - Management, Leasing and Marketing Fees (Details)

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Investments in Unconsolidated Real Estate Joint Ventures - Management, Leasing and Marketing Fees (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services $ 3,847 $ 5,426 $ 3,591
Development and Leasing Fee [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services 651 1,827 725
Loan Guarantee Fee [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services 452 746 463
Management and Marketing Fee [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services $ 2,744 $ 2,853 $ 2,403