Concentration of Credit Risk (Details)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Concentration of Credit Risk (Textuals) [Abstract]
Seniors housing communities based on the gross book value of real estate investments	76.40%
Hospital, MOBs and other healthcare assets percentage	23.60%
Number of states in which properties were located	43
Number of States Accounting for 10% or More of Total Revenues	1
Number of Canadian Provinces	2
Sunrise [Member]
Concentration of Credit Risk [Line Items]
Gross book value of real estate investments managed	24.40%
Atria Senior Living [Member]
Concentration of Credit Risk [Line Items]
Gross book value of real estate investments managed	31.50%
Brookdale Senior Living [Member]
Concentration of Credit Risk [Line Items]
Gross book value of real estate investments managed	12.60%
Percentage of Total Revenues Derived by Third Party	9.30%	12.50%
Percentage of net operating income derived from lease agreements	15.10%	18.30%
Kindred [Member]
Concentration of Credit Risk [Line Items]
Gross book value of real estate investments managed	8.40%
Percentage of Total Revenues Derived by Third Party	19.80%	25.20%
Percentage of net operating income derived from lease agreements	32.30%	37.00%