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
Mar. 31, 2013
Mar. 31, 2012
Management, Leasing and Marketing Fees [Line Items]    
Fees paid by unconsolidated joint ventures $ 1,065 $ 532
Development Fee [Member]
   
Management, Leasing and Marketing Fees [Line Items]    
Fees paid by unconsolidated joint ventures 71 0
Loan Guarantee Fee [Member]
   
Management, Leasing and Marketing Fees [Line Items]    
Fees paid by unconsolidated joint ventures 40 0
Management and Leasing Fee [Member]
   
Management, Leasing and Marketing Fees [Line Items]    
Fees paid by unconsolidated joint ventures 844 479
Marketing Fee [Member]
   
Management, Leasing and Marketing Fees [Line Items]    
Fees paid by unconsolidated joint ventures $ 110 $ 53