Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Income Statement:
Rental income	$ 251,246	$ 210,673
Operating expenses	(104,090)	(90,397)
Depreciation and amortization	(61,351)	(52,289)
General and administrative	(12,310)	(10,959)
Operating income	70,993	54,469
Interest income	288	708
Interest expense	(49,106)	(47,414)
Income from discontinued operations		1,911
Discontinued operations, properties sold or held for sale
Income Statement:
Rental income		7,239
Operating expenses		(3,438)
Depreciation and amortization		(1,552)
General and administrative		(254)
Acquisition related costs		(86)
Operating income		1,909
Interest income		2
Income from discontinued operations		$ 1,911

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Costs incurred and are directly related to generating revenues from leased and rented property or equipment.

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

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The aggregate revenue from real estate operations during the reporting period.

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