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Schedule III-Real Estate and Accumulated Depreciation (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REAL ESTATE AND ACCUMULATED DEPRECIATION
Aggregate gross cost of the property for federal income tax purposes	$ 7,343,322	$ 7,343,322
Changes in total real estate assets
Balances, beginning of year		9,012,706	7,489,735	6,908,507
Additions	943,159		1,909,530	784,717
Dispositions and retirements	(774,527)		(386,559)	(203,489)
Balances, end of year	9,181,338	9,181,338	9,012,706	7,489,735
Changes in accumulated depreciation
Balances, beginning of year		1,533,160	1,410,692	1,234,380
Additions		284,500	241,231	223,630
Dispositions and retirements		(258,088)	(118,763)	(47,318)
Balances, end of year	$ 1,559,572	$ 1,559,572	$ 1,533,160	$ 1,410,692
Buildings and improvements | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets		5 years
Buildings and improvements | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets		40 years
Tenant improvements | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets		5 years
Tenant improvements | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets		7 years
Equipment and furnishings | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets		5 years
Equipment and furnishings | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets		7 years

X

- Definition

Amount of depreciation expense and other additions to accumulated depreciation for the period.

+ References

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The amount that was removed from accumulated depreciation pertaining to real estate that was sold or retired in the period.

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Amount of increase to real estate investments during the period due to acquisitions, improvements and other additions made to real estate.

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The carrying amount of real estate sold or retired during the period.

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Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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-SubTopic 360

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Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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