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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 1,253 $ 1,225 $ 4,263 $ 2,548
Development and Leasing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 325 624 1,632 702
Loan Guarantee Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 182 23 564 209
Management and Marketing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 746 $ 578 $ 2,067 $ 1,637