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	$	79,323	$	107,236	$	123,945
Expenses:
	Interest expense		16,217		24,626		26,982
	Property operating expenses		2,354		6,131		8,678
	Provision for depreciation		17,697		29,723		37,378
Income (loss) from discontinued operations, net		$	43,055	$	46,756	$	50,907