PROPERTY ACQUISITIONS AND DISPOSITIONS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended		0 Months Ended		1 Months Ended	0 Months Ended	9 Months Ended
	Sep. 26, 2013	May 16, 2013	Jun. 30, 2013 property	Sep. 30, 2013	Sep. 30, 2013 property	Sep. 30, 2012	Sep. 26, 2013 Operating Partnership property	Aug. 29, 2013 Operating Partnership property	Jun. 30, 2007 Operating Partnership property	Sep. 26, 2013 Operating Partnership Series B Units	Sep. 30, 2013 Maryland 1 Property Acquired 2013/02/13 property	Sep. 30, 2013 Illinois 1 Property Acquired 2013/02/13 property	Sep. 30, 2013 Hawaii 2 Properties Acquired 2013/05/03 property	Sep. 30, 2013 Texas 1 Property Acquired 2013/05/08 property	Sep. 30, 2013 Maryland 1 Property Acquired 2013/06/10 property	Sep. 30, 2013 Arizona, 2 Properties Acquired 2013/07/25 property	Sep. 30, 2013 California, 19 Properties Acquired 2013/08/29 property	Sep. 30, 2013 California, 1 Property Acquired 2013/09/26 property
Property Acquisitions
Number of Properties					28						1	1	2	1	1	2	19	1
Total Consideration Paid				$ 278,424	$ 278,424						$ 12,321	$ 11,083	$ 27,560	$ 7,104	$ 13,688	$ 9,313	$ 186,427	$ 10,928
Cash Consideration Paid				160,885	160,885						8,029	7,592	27,648	7,057	500	9,183	96,085	4,791
Loans Assumed					7,122	147,592	98,960								7,122
Non-cash gain					2,556	13,499					2,215	341
Notes Issued to/from Seller				2,251	2,251							2,251
Previous equity interest					3,446						2,273	1,173
Net Liabilities (Assets) Assumed				125	125						(196)	(274)	(88)	47	(64)	130	519	51
Value of OP units issued				102,039	102,039	429									6,130		89,823	6,086
Number of OP Units Issued (in shares)					2,934,695										143,860		2,613,728	177,107
Acquisition Date Fair Value, Land				117,694	117,694						1,266	1,318	5,991	1,374	2,160	2,001	100,446	3,138
Acquisition Date Fair Value, Building				154,595	154,595						10,789	9,485	20,976	5,636	11,340	7,110	81,830	7,429
Acquisition Date Fair Value, Intangible				4,344	4,344						260	190	438	86		192	2,997	181
Closing costs - expensed					1,791						6	90	155	8	188	10	1,154	180
Number of self-storage facilities (properties) acquired							1	19	10
Number of self storage properties								20
Cash portion of payment for acquisition							100,876
Preferred OP units issued as part of the acquisition (in shares)										1,342,727
Preferred OP units issued as part of the acquisition										33,568
Common OP units issued as part of the acquisition (in shares)							1,448,108
Common OP units issued as part of the acquisition							62,341
Defeasance costs	9,153			(9,153)	(9,153)
Gain on condemnation of a portion of land			800
Number of self storage property which portion of land condemned			1
Property sold		950			889
Gain (loss) on sale of property		$ 0