DESCRIPTION OF BUSINESS (Details)	Mar. 31, 2016 property tenant	Dec. 31, 2015 property
Real estate properties
Number of real estate properties	1,300
Number of properties leased	575
Number of real estate properties	39	39
Number of properties classified as held-for-sale	8	11
Development Projects
Real estate properties
Number of real estate properties	4
Number of properties included in investments in unconsolidated entities	2
Seniors Housing Communities
Real estate properties
Number of independent third party managed properties	304
Brookdale Senior Living
Real estate properties
Number of properties included in investments in unconsolidated entities	6
Number of properties leased	140
Number of properties included in investments in unconsolidated entities, pursuant to management agreement	1
Kindred
Real estate properties
Number of properties included in investments in unconsolidated entities	1
Number of properties leased	69
Ardent
Real estate properties
Number of properties leased	10
Brookdale Senior Living Inc. and Kindred Healthcare, Inc.
Real estate properties
Concentration Risk, Number of Tenants | tenant	3
Triple-Net Leased Properties
Real estate properties
Number of real estate properties	34
Number of properties classified as held-for-sale	1	2
Triple-Net Leased Properties | Kindred
Real estate properties
Number of properties classified as held-for-sale	1