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SUBSEQUENT EVENTS - Acquisition (Details) 10Q - Subsequent event - Texas $ in Millions	1 Months Ended
	Jan. 31, 2018 USD ($) facility shares
Subsequent Events
Number of self-storage facilities acquired | facility	1
Total consideration	$ 12.2
Cash paid for acquisition	7.4
Units issued	$ 4.8
Units issued (in shares) | shares	168,011
Lock-up period	13 months
Exchange ratio (in shares) | shares	1

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- Definition

Represents the number of real estate properties that were acquired.

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- Definition

The number of common shares issued for each common unit to satisfy a redemption obligation.

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- Definition

Represents the lock-up period for redemption of units issued.

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Shares classified as temporary equity issued during the period.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB
-Name Accounting Standards Codification
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Value of new stock classified as temporary equity issued during the period.

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