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STORAGE PROPERTIES - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
STORAGE FACILITIES
Storage facilities	$ 4,161,715	$ 3,998,180
Less: Accumulated depreciation	(752,925)	(671,364)
Storage facilities, net (including VIE assets of $291,496 and $208,048, respectively)	3,408,790	3,326,816
Land
STORAGE FACILITIES
Storage facilities	711,140	649,744
Buildings and improvements
STORAGE FACILITIES
Storage facilities	3,086,252	2,928,275
Equipment
STORAGE FACILITIES
Storage facilities	182,958	217,867
Construction in progress
STORAGE FACILITIES
Storage facilities	$ 181,365	$ 202,294

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The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(3))
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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
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