DISPOSITIONS - Real Estate Assets Classified As Held For Sale (Details) $ in Thousands	Mar. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	8	11
Assets held for sale	$ 54,263	$ 93,060
Liabilities related to assets held for sale	$ 12,625	$ 34,340
Triple-Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	1	2
Assets held for sale	$ 2,393	$ 4,488
Liabilities related to assets held for sale	$ 0	$ 44
MOB Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	7	8
Assets held for sale	$ 51,870	$ 68,619
Liabilities related to assets held for sale	$ 12,625	$ 24,759
Senior Living Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	0	1
Assets held for sale	$ 0	$ 19,953
Liabilities related to assets held for sale	$ 0	$ 9,537