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Investment in Unconsolidated Joint Ventures (Textuals) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Loan
Dec. 31, 2011
Dec. 31, 2010
Equity Method Investments and Joint Ventures [Abstract]      
Number of possible loan extensions (loans) 2    
Period of loan extension 1 year    
Fees earned from unconsolidated joint ventures $ 8.7 $ 10.1 $ 10.4