Real Estate Properties (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Statements of Operations:
Rental income	$ 275,048	$ 243,378
Operating expenses	(109,659)	(97,236)
Depreciation and amortization	(66,523)	(58,019)
General and administrative	(17,266)	(11,536)
Operating income	80,972	74,085
Interest and other income	458	285
Loss from discontinued operations	(1,912)	(3,089)
Discontinued operations, properties sold or held for sale
Statements of Operations:
Rental income	4,807	7,868
Operating expenses	(6,035)	(6,854)
Depreciation and amortization		(3,332)
General and administrative	(684)	(774)
Operating income	(1,912)	(3,092)
Interest and other income		3
Loss from discontinued operations	$ (1,912)	$ (3,089)

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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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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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