Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Real Estate Joint Ventures (Joint Venture Fees) (Details)

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Investments in Unconsolidated Real Estate Joint Ventures (Joint Venture Fees) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 588 $ 806 $ 1,776 $ 3,259
Management and Marketing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 564 656 1,676 2,199
Development and Leasing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 20 65 87 611
Loan Guarantee Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 4 $ 85 $ 13 $ 449