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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) (USD $) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Mortgage notes | Dec. 31, 2012 Capital leases | Dec. 31, 2011 Capital leases | Dec. 31, 2012 Mortgage bonds | Dec. 31, 2011 Mortgage bonds | Dec. 31, 2012 Buildings and improvements | Dec. 31, 2012 Buildings and improvements Maximum | Dec. 31, 2012 Equipment
SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |  |  |  |  |  |  |
Aggregate cost for federal income tax purposes | $ 5,200,000,000 |  |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation |  |  |  |  |  |  |  |  |  |
Period over which real estate assets are depreciated, maximum |  |  |  |  |  |  |  | 40 years | 40 years | 12 years
Secured debt | $ 724,477,000 | $ 861,615,000 | $ 690,500,000 | $ 13,792,000 | $ 14,211,000 | $ 14,700,000 | $ 14,700,000 |  |  |

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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower and amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The amount of the cost basis of a real estate investment for federal income tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN6) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 + Details
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