Quarterly report pursuant to Section 13 or 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, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Management, Leasing and Marketing Fees [Line Items]        
Fees paid by unconsolidated joint ventures $ 918 $ 521 $ 1,983 $ 1,053
Development Fee [Member]
       
Management, Leasing and Marketing Fees [Line Items]        
Fees paid by unconsolidated joint ventures (8) 0 63 0
Loan Guarantee Fee [Member]
       
Management, Leasing and Marketing Fees [Line Items]        
Fees paid by unconsolidated joint ventures 40 0 80 0
Management and Leasing Fee [Member]
       
Management, Leasing and Marketing Fees [Line Items]        
Fees paid by unconsolidated joint ventures 786 474 1,631 953
Marketing Fee [Member]
       
Management, Leasing and Marketing Fees [Line Items]        
Fees paid by unconsolidated joint ventures $ 100 $ 47 $ 209 $ 100