SEGMENT DISCLOSURE (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment disclosure
Interest									$ (19,073,000)	$ (17,929,000)	$ (18,856,000)
General and administrative									(7,332,000)	(2,568,000)	(2,773,000)
Asset management fees and other fees to related parties									(25,222,000)	(21,767,000)	(20,924,000)
Transaction costs									(1,563,000)	(5,063,000)	(632,000)
Depreciation and amortization									(69,047,000)	(68,644,000)	(69,943,000)
Bargain purchase gain				4,918,000					4,918,000
INCOME FROM CONTINUING OPERATIONS	(3,469,000)	975,000	4,170,000	10,284,000	2,290,000	1,759,000	4,808,000	5,822,000	11,960,000	14,679,000	19,797,000
Income from operations of assets held for sale									12,638,000
INCOME FROM DISCONTINUED OPERATIONS	4,056,000	3,305,000	4,344,000	933,000					12,638,000
NET INCOME	587,000	4,280,000	8,514,000	11,217,000	2,290,000	1,759,000	4,808,000	5,822,000	24,598,000	14,679,000	19,797,000
Net income attributable to noncontrolling interests									(220,000)	(213,000)	(208,000)
NET INCOME ATTRIBUTABLE TO STOCKHOLDERS	475,000	4,285,000	8,399,000	11,219,000	2,180,000	1,765,000	4,695,000	5,826,000	24,378,000	14,466,000	19,589,000
Reportable segments
Segment disclosure
Total segment net operating income									127,410,000	129,208,000	131,275,000
Reconciliation
Segment disclosure
Interest									(19,073,000)	(17,929,000)	(18,856,000)
General and administrative									(5,463,000)	(1,126,000)	(1,123,000)
Asset management fees and other fees to related parties									(25,222,000)	(21,767,000)	(20,924,000)
Transaction costs									(1,563,000)	(5,063,000)	(632,000)
Depreciation and amortization									$ (69,047,000)	$ (68,644,000)	$ (69,943,000)