CONCENTRATION OF CREDIT RISK (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended				3 Months Ended										3 Months Ended				1 Months Ended		3 Months Ended			3 Months Ended				1 Months Ended
	Mar. 31, 2014 property state province	Oct. 31, 2013 Kindred	Sep. 30, 2013 Kindred property	Sep. 30, 2013 Kindred Lease	Mar. 31, 2014 Kindred	Mar. 31, 2014 Total gross book value of properties ATRIA	Mar. 31, 2014 Total gross book value of properties SUNRISE	Mar. 31, 2014 Total gross book value of properties Brookdale Senior Living	Mar. 31, 2014 Total gross book value of properties Kindred	Mar. 31, 2014 Total revenues state	Mar. 31, 2014 Total revenues Brookdale Senior Living	Mar. 31, 2013 Total revenues Brookdale Senior Living	Mar. 31, 2014 Total revenues Kindred	Mar. 31, 2013 Total revenues Kindred	Mar. 31, 2014 Total NOI state	Mar. 31, 2014 Total NOI Brookdale Senior Living	Mar. 31, 2013 Total NOI Brookdale Senior Living	Mar. 31, 2014 Total NOI Kindred	Mar. 31, 2013 Total NOI Kindred	Sep. 30, 2013 Hospitals Kindred Lease	Sep. 30, 2013 Skilled Nursing Facilities Kindred Lease	Mar. 31, 2014 Skilled Nursing Facilities Kindred property	Mar. 31, 2014 Senior Housing Communities [Member] property	Mar. 31, 2014 Senior Housing Communities [Member] Atria and Sunrise [Member] property	Mar. 31, 2014 Senior Housing Communities [Member] Total gross book value of properties	Mar. 31, 2014 Hospitals Medical Office Building and Other [Member] Total gross book value of properties	Mar. 31, 2014 ATRIA	Dec. 31, 2013 ATRIA	Apr. 28, 2014 Subsequent Event [Member]
Concentration Risk [Line Items]
Concentration Percentage						19.80%	13.70%	9.60%	3.00%		5.50%	5.70%	7.40%	9.30%		9.00%	9.50%	12.20%	15.40%						63.70%	36.30%
Number of states	46
Number of Canadian provinces	2
Number of states accounting for more than 10% of total revenues										1
Number of states accounting for more than 10% of net operating income															1
Number of Properties whose leases were renewed			48	48																22	26
Number of Properties whose leases are set to expire			108	108
Annual Base Rent Of Renewed Leases					$ 95.9
Increase In Base Rent On Renewed Leases					15
Payment Received Related To Lease Renewal		$ 20
Number of Properties with new Leases	55
Number of Properties whose leases were not renewed																						60
Number of Properties with new Leases Transitioned to New Operators	6
Number of Properties previously leased to Kindred that are going to be Sold	5
Number of Properties previously leased to Kindred that are under contract to be sold	4
Number of seniors housing communities under long-term management agreements																							239	237
Ownership interests accounted for under the equity method (as a percent)																											34.00%	34.00%
Competitor's Ownership of Sunrise																													24.00%