Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement:
Rental income	$ 261,661	$ 241,785	$ 768,281	$ 670,396
Operating expenses	(112,577)	(104,683)	(324,760)	(285,703)
Depreciation and amortization	(63,437)	(56,389)	(188,340)	(159,072)
General and administrative	(14,592)	(11,692)	(40,266)	(34,275)
Acquisition related costs	(1,066)	(4,805)	(5,002)	(9,722)
Operating income	69,989	54,969	209,913	172,377
Interest income	399	320	1,100	1,395
Income from discontinued operations		1,720		5,669
Discontinued operations, properties sold or held for sale
Income Statement:
Rental income		6,573		20,426
Operating expenses		(3,284)		(9,428)
Depreciation and amortization		(1,336)		(4,467)
General and administrative		(228)		(717)
Acquisition related costs		(5)		(148)
Operating income		1,720		5,666
Interest income				3
Income from discontinued operations		$ 1,720		$ 5,669

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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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 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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