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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 1,727 $ 758 $ 3,010 $ 1,324
Development and Leasing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 727 70 1,307 78
Loan Guarantee Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received 187 146 383 187
Management and Marketing Fee [Member]        
Management, Leasing and Marketing Fees [Line Items]        
Fees received $ 813 $ 542 $ 1,320 $ 1,059