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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
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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

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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 1.N.Q3) -URI http://asc.fasb.org/extlink&oid=6369664&loc=d3e30840-122693 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 1 -Section N + Details
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