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INVESTMENT ACTIVITY (Details) (USD $)	3 Months Ended	6 Months Ended	3 Months Ended				12 Months Ended	0 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2013 Self-storage facilities property	Mar. 31, 2012 Self-storage facilities property	Mar. 31, 2013 Self-storage facilities 2013 Acquisitions Property in Arizona property	Mar. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions	Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions property	Sep. 28, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture property	Mar. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture	Mar. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions Storage Deluxe assets	Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions Storage Deluxe assets facility property
Development
Development costs	$ 2,655,000	$ 7,400,000
Self-storage facilities
Amount of Storage Deluxe transaction											560,000,000
Number of Self Storage Facilities											22
Number of self-storage facilities acquired (in properties)			1	37	1		22	9			6
Aggregate purchase price of acquisition			6,900,000	432,300,000	6,900,000		128,400,000				201,900,000
Intangible value of the in-place leases					600,000		13,200,000	8,300,000			12,300,000
Estimated life					12 months		12 months	12 months			12 months
Amortization expense					100,000	3,100,000			2,100,000	2,700,000
Assumed mortgage debt, at fair value							13,900,000				93,100,000
Outstanding principal balance of mortgage debt assumed on acquisitions							13,400,000				88,900,000
Premium on debt assumed on acquisitions							500,000				4,200,000
Acquisition of remaining interest in real estate ventures (as a percent)								50.00%
Cash paid for acquisition of remaining interest in real estate ventures								21,700,000
Amount of debt repaid								59,300,000
Fair value of storage facilities								$ 102,000,000
Number of properties, assumed mortgage							2

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The aggregate expense charged against earnings to allocate the cost of acquired intangible assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.

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Amount of cash paid to acquire the entity.

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