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Real estate (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Property sold, aggregate, carrying value |  |  | $ 180,600,000
Repayment of principal amount |  | 97,200,000 |
Net proceeds from sales of real estate assets | 562,705,000 | 215,930,000 | 1,823,181,000
Gain (loss) on sale of leased assets, net operating leases included in income from discontinued operations |  | 22,200,000 |
Mezzanine loans provided to purchaser of net lease assets |  | 105,600,000 |
Property subject to or available for operating lease sold in addition to previous sales aggregate carrying value |  |  | 119,700,000
Gain (loss) on additional sale of leased assets net operating leases |  |  | 20,100,000
Net Lease Assets |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Property sold, aggregate, carrying value | 9,800,000 | 34,100,000 |
Net gain on sale of net lease assets | 2,400,000 | 3,200,000 |
Commercial Operating Properties |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Property sold, aggregate, carrying value | 29,300,000 | 17,900,000 |
Land |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Property sold, aggregate, carrying value | 72,100,000 | 9,500,000 | 3,100,000
Portfolio Lease Asset Sale | Net Lease Assets |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of net lease assets sold | 12 |  | 32
Property sold, aggregate, carrying value | 105,700,000 |  | 1,050,000,000
Net gain on sale of net lease assets | 24,900,000 |  | 250,300,000
Repayment of principal amount | 50,800,000 |  |
Net proceeds from sales of real estate assets |  |  | $ 1,350,000,000

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- Definition The net gain (loss) arising from the lessor's additional sale of assets available-for-lease under contractual arrangements classified as operating leases. + References No definition available. + Details
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- Definition The net gain (loss) arising from the lessor's sale of assets held or available-for-lease under contractual arrangements classified as operating leases and recognized in income from discontinued operations. + References No definition available. + Details
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- Definition Represents the amount of mezzanine loans provided to the purchaser of net lease assets. + References No definition available. + Details
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- Definition Represents the carrying value of the property subject to or available for lease that was sold in addition to previous sales during the period. + References No definition available. + Details
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- Definition The net gain (loss) arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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