DISPOSITIONS (Details) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2015 property	Mar. 31, 2014	Apr. 24, 2015 property	Dec. 31, 2014 property
Significant Acquisitions and Disposals
Properties classified as held for sale	28			50
Assets held for sale	$ 174,225,000			$ 210,463,000
Liabilities of assets held-for-sale	38,263,000			50,225,000
Impairment of real estate	19,200,000	4,800,000
Impairment of long-lived assets to be disposed of		400,000
Revenues:
Rental income	72,000	2,200,000
Interest and other income	0	750,000
Total Revenues	72,000	2,950,000
Expenses:
Interest	252,000	678,000
Depreciation and amortization	12,000	281,000
Property-level operating expenses	88,000	281,000
Other	143,000	116,000
Total expenses	495,000	1,356,000
(Loss) income before gain on real estate dispositions	(423,000)	1,594,000
(Loss) gain on real estate dispositions, net	0	1,437,000
Discontinued operations	(423,000)	3,031,000
Triple-Net Leased Properties
Significant Acquisitions and Disposals
Properties classified as held for sale	14			14
Assets held for sale	46,519,000			34,097,000
Liabilities of assets held-for-sale	1,346,000			1,330,000
MOB Operations
Significant Acquisitions and Disposals
Properties classified as held for sale	14			36
Assets held for sale	127,706,000			176,366,000
Liabilities of assets held-for-sale	36,917,000			48,895,000
2015 Dispositions
Significant Acquisitions and Disposals
Proceeds from disposition of assets, including termination fees	336,700,000
Lease termination fees	5,000,000
Proceeds deposited in escrow	153,900,000
Gain (loss) on disposition of assets	28,200,000
Deferred gain on sale of property	21,400,000
Deferred gain on sale of property, term	5 years
2015 Dispositions | Triple-Net Leased Properties
Significant Acquisitions and Disposals
Number of real estate properties sold	21
2015 Dispositions | MOB Operations
Significant Acquisitions and Disposals
Number of real estate properties sold	22
2015 Dispositions | MOB Operations | Subsequent Event
Significant Acquisitions and Disposals
Number of real estate properties sold			2
Proceeds from disposition of assets, including termination fees			46,000,000
2014 Dispositions
Significant Acquisitions and Disposals
Proceeds from disposition of assets, including termination fees		26,200,000
Gain (loss) on disposition of assets		2,900,000
Expenses:
(Loss) gain on real estate dispositions, net		$ 1,700,000
2014 Dispositions | Triple-Net Leased Properties
Significant Acquisitions and Disposals
Number of real estate properties sold		3
2014 Dispositions | MOB Operations
Significant Acquisitions and Disposals
Number of real estate properties sold		3
Discontinued Operations | Triple-Net Leased Properties
Significant Acquisitions and Disposals
Properties classified as held for sale	3			3
Discontinued Operations | MOB Operations
Significant Acquisitions and Disposals
Properties classified as held for sale	2			2