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Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Management Fees [Member]
       
Revenue from related party transactions $ 2,796 $ 2,770 $ 8,251 $ 7,393
Leasing Fees [Member]
       
Revenue from related party transactions 622 826 2,856 3,627
Construction and Development Fees [Member]
       
Revenue from related party transactions $ 1,860 $ 1,786 $ 3,615 $ 4,182