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PRO FORMA FINANCIAL INFORMATION (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 $ / shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2017 USD ($) property $ / shares	Dec. 31, 2016 USD ($) property $ / shares	Dec. 31, 2015 $ / shares
Consolidated results of operations on a pro forma basis
Pro forma revenue | $									$ 560,852	$ 523,821
Pro forma income | $									$ 145,941	$ 115,269
Earnings per share from continuing operations:
Basic - as reported (in dollars per share)	$ 0.22	$ 0.21	$ 0.18	$ 0.14	$ 0.13	$ 0.13	$ 0.11	$ 0.08	$ 0.74	$ 0.45	$ 0.43
Diluted - as reported (in dollars per share)	$ 0.22	$ 0.21	$ 0.18	$ 0.14	$ 0.13	$ 0.13	$ 0.11	$ 0.08	0.74	0.45	$ 0.42
Basic - as pro forma (in dollars per share)									0.80	0.63
Diluted - as pro forma (in dollars per share)									$ 0.80	$ 0.62
Self-storage facilities
Self-storage facilities
Number of self-storage facilities acquired | property									7	28
Aggregate purchase price | $									$ 80,700	$ 403,600

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