Dispositions, Assets Held for Sale and Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2012

Dispositions, Assets Held for Sale and Discontinued Operations (Tables) [Abstract]

Summary of real property disposition activity

		Year Ended
		December 31, 2012		December 31, 2011		December 31, 2010
Real property dispositions:
	Seniors housing triple-net	$	372,378	$	150,755	$	170,290
	Medical facilities		149,344		35,295		14,092
	Total dispositions		521,722		186,050		184,382
Add: Gain (loss) on sales of real property, net			100,549		61,160		36,115
	Seller financing on sales of real property		(12,000)		0		(1,470)
Proceeds from real property sales		$	610,271	$	247,210	$	219,027

Reclassification impact as result of classifying properties as discontinued operations

			Year Ended December 31,
		2012		2011		2010
Revenues:
	Rental income	$	85,025	$	113,282	$	133,145
Expenses:
	Interest expense		18,563		27,894		30,172
	Property operating expenses		1,610		6,073		8,687
	Provision for depreciation		23,200		33,454		41,001
Income (loss) from discontinued operations, net		$	41,652	$	45,861	$	53,285