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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 609 $ 1,332 $ 1,188 $ 2,453
Management and Marketing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 570 797 1,112 1,544
Development and Leasing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 35 353 67 545
Loan Guarantee Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 4 $ 182 $ 9 $ 364