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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Real Estate Properties [Line Items] |  |  |  |
Real estate available and held for sale |  | $ 360,517,000 | $ 635,865,000 |
Income from sales of residential property | 27,900,000 | 86,658,000 | 63,472,000 | 5,721,000
Residential Operating Properties |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Real estate available and held for sale |  | 221,000,000 | 374,100,000 |
Land |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Real estate available and held for sale |  | 132,189,000 | 181,278,000 |
Number of properties transferred from held-for-sale to held-for-use |  | 2 |  |
Property transferred from held for sale |  | 49,700,000 |  |
Number of real estate properties transferred to held for sale |  | 3 |  |
Property transferred to held for sale |  | 31,800,000 |  |
Number of real estate properties sold |  | 3 |  |
Income from sales of residential property |  | 600,000 |  |
Net Lease |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Real estate available and held for sale |  | 0 | 0 |
Property transferred to held for sale |  | 9,800,000 |  |
Number of real estate properties sold |  | 5 |  |
Gain (Loss) on Disposition of Real Estate, Discontinued Operations |  | 3,600,000 |  |
Commercial Operating Properties |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of properties transferred from held-for-sale to held-for-use |  |  | 2 |
Property transferred from held for sale |  |  | 49,800,000 |
Number of real estate properties sold |  | 6 |  |
Depreciation expense on reclassified assets |  |  | 3,300,000 |
Other Income | Commercial Operating Properties |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Reclassification of results of operations |  |  | 21,148,000 | 21,663,000
Real Estate Expenses | Commercial Operating Properties |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Reclassification of results of operations |  |  | $ (22,603,000) | $ (24,297,000)

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- Definition Number of Real Estate Properties Sold + References No definition available. + Details
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- Definition Property Transferred to Held for Sale, Aggregate, Carrying Value + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity. + References No definition available. + Details
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- Definition Reclassification of Results of Operations + References No definition available. + Details
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- Definition For the asset that is reclassified back to held and use from held-for-sale, the depreciation expense recognized when the asset is reclassified. This represents the difference between the carrying value at the time the decision to reclassify is made and the carrying amount that the asset would have had if it had never been classified as held for sale (including consideration of depreciation expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2459-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 44 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1756-110224 + Details
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