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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) (USD $)								12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Mortgage notes	Dec. 31, 2011 Capital leases	Dec. 31, 2010 Capital leases	Dec. 31, 2011 Mortgage bonds	Dec. 31, 2010 Mortgage bonds	Dec. 31, 2011 Buildings and improvements Y	Dec. 31, 2011 Equipment Y
SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION
Aggregate cost for federal income tax purposes	$ 4,700,000,000
Real Estate And Accumulated Depreciation
Period over which real estate assets are depreciated, maximum (in years)								40	12
Secured debt	$ 861,615,000	$ 654,010,000	$ 832,700,000	$ 14,200,000	$ 14,575,000	$ 14,700,000	$ 14,700,000

X

- 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.

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X

- Definition

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

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X

- 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

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