Description of Business (Details)	6 Months Ended
	Jun. 30, 2011
Description of Business (Textuals) [Abstract]
Seniors housing communities, assets	357
Skilled nursing facilities, assets	187
Hospitals, assets	40
Medical office buildings and other properties, assets	135
Total assets of geographically diverse portfolio	719
Number of States	43
Number of Canadian Provinces	2
Properties leased to healthcare operating companies	393
Number of seniors housing communities pursuant to long-term management agreements	199