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, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services $ 2,452 $ 3,847 $ 5,426
Management and Marketing Fee [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services 2,310 2,744 2,853
Development and Leasing Fee [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services 124 651 1,827
Loan Guarantee Fee [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services $ 18 $ 452 $ 746