Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Reclassifications (Details)

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Summary of Significant Accounting Policies - Reclassifications (Details) (Real Estate Operating Income [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Reclassification for 2011 [Member]
 
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount $ 18.1
Reclassification for 2010 [Member]
 
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount $ 1.2