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PRO FORMA FINANCIAL INFORMATION (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) $ / shares	Jun. 30, 2014 $ / shares	Jun. 30, 2015 USD ($) property $ / shares	Jun. 30, 2014 USD ($) $ / shares	Dec. 31, 2014 USD ($) property
Consolidated results of operations on a pro forma basis
Pro forma revenue | $			$ 215,466	$ 202,565
Pro forma income from continuing operations | $			$ 39,704	$ 20,774
Earnings per share from continuing operations:
Basic - as reported (in dollars per share)	$ 0.07	$ 0.04	$ 0.12	$ 0.06
Diluted - as reported (in dollars per share)	$ 0.07	$ 0.04	0.11	0.06
Basic - as pro forma (in dollars per share)			0.22	0.12
Diluted - as pro forma (in dollars per share)			$ 0.22	$ 0.12
Self-storage facilities
Self-storage facilities
Number of self-storage facilities acquired (in properties) | property			11		53
Aggregate purchase or sale price | $	$ 93,000		$ 93,000		$ 568,200

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